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Description
1987 - 1996 Isuzu And GMC FSR, W6 Rear Helper Leaf Spring 56-121*Diagram Spring May Differ From Actual Spring* Number of Leaves 7 (7 PD) Leaf Spring Width 70mm (2 3 4") A Leaf Spring Length: 19 1 2" B Leaf Spring Length: 19 1 2" C Leaf Spring Arch: 3 1 16" D Leaf Spring Pack Thickness: 3 1 16 Leaf Spring Capacity: N A Leaf Spring OEM Numbers: 1513404570 and 94051022 Leaf Spring Eye Bushings: Front Slipper Rear Slipper Leaf Spring Material: 2 10mm, 4 11mm, 1 10mm, Pad 1 4mm Location Rear Verify the OEM part number
- *Diagram Spring May Differ From Actual Spring*
- Number of Leaves - 7 (7/PD)
- Leaf Spring Width - 70mm (2-3/4")
- A - Leaf Spring Length: 19-1/2"
- B - Leaf Spring Length: 19-1/2"
- C - Leaf Spring Arch: 3-1/16"
- D - Leaf Spring Pack Thickness: 3-1/16
- Leaf Spring Capacity: N/A
- Leaf Spring OEM Numbers: 1513404570 and 94051022
- Leaf Spring Eye Bushings: Front Slipper / Rear Slipper
- Leaf Spring Material: 2/10mm, 4/11mm, 1/10mm, Pad 1/4mm
- Location - Rear
Verify the OEM part number and measurements to confirm compatibility before purchasing. Need help? Visit: How to Identify a Leaf Spring.
The 56-121 rear helper leaf spring fits on 1987 - 1996 Isuzu and GMC FSR & W6 heavy duty trucks. This spring is 70mm (2-3/4") wide, is a 7 leaf spring with 1 pad and the OEM part numbers are 1-51340-457-0 and 94051022.
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4.2 ★★★★★
Based on 506 reviews
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Product Reviews
★★★★★ 5
Most comfortable office chair this fluffy guy has ever sat in.
Color: Black, Style: Classic
This chair is incredibly comfortable—easily the most comfortable one I’ve ever sat in. At around 300lbs, I’ve struggled to find a chair that’s both supportive and spacious. Most options feel tight, with the armrests pressing into my hips. Not this one. If anything, I feel small in it—there’s plenty of room on either side. It’s like going from a cramped budget airline seat to first class on a full-service carrier.
The lumbar support is the best I’ve ever used. The materials are top-notch—everything from the base to the legs to the casters is metal (feels like steel). The casters themselves use what look like inline skate wheels and glide effortlessly across carpet—almost too well on hard surfaces, so you might want to consider a rug. Not a flaw, just something to keep in mind.
I’ve paid twice as much for chairs that felt half as good, so in my opinion, this is an excellent value. The faux leather looks great and the stitching appears durable. While it may not last as long as real leather or high-quality fabric, it should hold up for a reasonable amount of time.
Tilt functionality is basic—just two settings: upright or slightly reclined. Honestly, that’s all I need. If you’re looking for something to nap in, this might not be the chair for you. But for office work or gaming, it absolutely delivers all-day comfort.
For reference, I’m 5'8", and the headrest aligns perfectly with the back of my head. If you're 6'5", it might end up being more of a neck rest.
And I have to give a special shoutout to the included T-shaped hex wrench. It may sound silly, but this alone earns it a 5-star review from me. Every other chair I’ve bought includes those awful angled hex wrenches that make you slam your knuckles into the frame with every turn—often accompanied by some colorful language. Sure, I have my own tools, but finding where my wife hid them isn't always easy. A good-quality tool in the box? That’s thoughtful and appreciated.
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Reviewed in the United States on June 19, 2025
★★★★★ 5
Wide and comfortable office chair
Color: Black, Style: Classic, Color: Black, Style: Classic
It's made of very fine leather and in good quality. It has a pump to pump air to the back of the chair, so I can adjust the softness of the chair back. It's a very wide chair. Maybe the widest one I ever bought. I can only sit half of its space. It's very easy to install, the alignments are perfect. Its arm and height is adjustable. The wheels are advance ones which make it move through the floor smoothly. It looks an advance chair if you want an upgraded experience.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Excellent Comfort and Great Value for a Home Office
Color: Elegant Grey, Color: Elegant Grey
I am extremely happy with this office chair and feel it offers excellent value for the price. The chair was easy to assemble, and all the parts fit together perfectly. Once assembled, it feels sturdy, stable, and well-made.
The high-back design provides outstanding support for my back, neck, and shoulders. The seat cushion is thick and comfortable, making it easy to sit for long periods while working, studying, or gaming. The padded headrest adds extra comfort, and the faux leather material looks stylish and gives the chair a premium appearance.
One of my favorite features is the flip-up armrests. They are comfortable to use and make it easy to slide the chair under my desk when I need extra space. The height adjustment, smooth swivel, and rocking function all work well and allow me to find the perfect sitting position throughout the day.
The chair arrived exactly as described and exceeded my expectations in both comfort and appearance. It looks great in my home office and has made long work sessions much more enjoyable. If you're looking for a comfortable, attractive, and affordable office chair, I highly recommend this product. I would definitely purchase it again and would gladly give it five stars.
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Comfortable and Stylish Office Chair
I’ve been using this chair for my home office, and it’s been very comfortable. The high back provides good support, and the lumbar support helps reduce strain during long hours at my desk. The leather looks nice and gives the chair a professional appearance. I really like the flip-up armrests because they make it easy to slide the chair under the desk when not in use. The rocking function is a nice feature for relaxing during breaks, and the chair rolls and swivels smoothly. Overall, it’s a comfortable, well-made office chair that looks great and provides excellent support for everyday work.
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Excellent lumbar support and easy assembly
I bought this chair because of my lower back pain, and it has been very comfortable to use. The leather feels soft, and the lumbar support is excellent. Assembly was easy, and the tools included, especially the screwdriver design were very well thought out, which made the whole setup process much easier.
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Reviewed in the United States on June 2, 2026
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