1984-1993 C4 Sport Seat Lumbar Diaphragm Replacement Pair
Restore correct lumbar support to your 1984–1993 C4 Corvette sport seats with this laser-cut rubber lumbar pump diaphragm pair — a direct replacement for worn or broken originals.
The lumbar pump diaphragm is the working heart of the C4 Corvette sport seat lumbar support system. When the diaphragm cracks, tears, or loses its shape the lumbar pump loses pressure and support disappears entirely — leaving the seat feeling flat and unsupported on every drive. Replacing the diaphragm restores the pump to full function without replacing the entire seat assembly.
These laser-cut rubber diaphragms are precision cut for accurate fitment in the 1984–1993 C4 Corvette sport seat lumbar pump. Direct replacements for worn or broken originals — sold as a pair for a complete repair. Made in the USA.
Fits the Following Corvette Models:
1984–1993 C4 Corvette — Sport Seats Only.
Features / Benefits:
- Rubber lumbar pump diaphragm pair for 1984–1993 C4 Corvette sport seats
- Restores correct lumbar pump pressure and seat support function
- Laser cut for precise fitment in the original lumbar pump location
- Direct replacement for worn, cracked, or broken original diaphragms
- Sold as a pair — complete car set for both seats
- Made in the USA
Material / Finish:
Laser-cut rubber construction for correct flexibility, durability, and accurate fitment in the lumbar pump assembly.
Dimensions:
Diameter: 1¼ in.
Because Details Matter:
Lumbar support on a C4 sport seat is not a luxury — it is part of what makes the car feel right on a long drive or a spirited run. A failed diaphragm turns a supportive sport seat into a flat one. This laser-cut rubber pair restores the pump to full function quickly and correctly — made in the USA and built to fit precisely where the original did.
Also known under these part numbers: (For reference only)