1963 Mopar B bodies had the 20 inch front segment, that changed in 1964 to the longer front sections  The original post you responded to specified 67 Coronet. Mopar develop the 002 and 003 Super Stock springs originally and intended use were made for the 1968 Hemi A body cars, hence the 20 inch front segment. I'm under the impression that all of the S.S. springs Mopar has sold for drag racing have the 20 inch front segments Maybe not  I think you're right. Pretty sure the Challenger had longer springs but I switched to SS springs and the offset hanger kit. Since I didn't want to end up with clearance problems we stuck with the 20" when we swapped to the split mono's.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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