I plan to go for stiffer front torsion bars on my 1974 Petty Gran National Dodge Charger. I took the bars out for measurement and found a length of 37 inches. The bars have the 37 and 1100 stamped on the end.

The usual B-Body bar would be 41 inch long. This 37 inch length left me puzzled. The diameter of the HEX end is 1inch 5/8. Are these from an older 1950's MOPAR or only custom made for racing ?