Front - Set Back Axle - Eye By Slipper From 11/19/81
From November 20, 1981
55-956/55-1232 are identical except for the shockeye
Early versions of 55-956 and 55-966 has a hook on the second leaf
In 2013 some applications required redesigned springs to comply with new stopping distance rules
These redesigned springs are listed below the original version
Both the original and redesigned versions continue to be used on new applications