Hypercoils 16" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 125 lb. LY23471 or a trans brake

or a trans brake

2 x 2 in Oval

It can be plumbed right to left or left to right

Steel mounts have been updated and now fit the newer and original 302-351W small blocks

Hypercoils 16" UHT Barrel 2-1/2" I.D. Coil-Over Spring - 125 lb. LY23471 or a trans brakeOptimum Body Diameter (OBD) Hypercoils feature a unique design concept that adjusts the body diameter of the spring relative to the end coils. The OBD design enables Hyperco to take full advantage of its ultra high tensile material by optimizing the applied stress through adjusting the spring's body diameter. The results are in and they are simply incredible: More Deflection Less Weight Increased Rate Linearity More Resistance to Bowing Fits All