1987 - 1996 Isuzu And GMC FSR, W6 Rear Helper Leaf Spring 56-121

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Isuzu and GMC helper leaf spring part number 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


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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Quality: Lasts longer. High-quality, durable parts that can withstand use and wear over time.Performance: Performs better. Parts that enhance and maintain the performance of you vehicle. Correct fit and function as expected.Value for Money: Cost with quality balanced. No better products at any price point.Brand Reputation: 30+ years of customer satisfaction.

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