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I have a '78 C3 and I have a chance to buy lower rocker panels that fit a '76. Although there may be a 1/4 inch difference in length, do you think I will have a problem or should I take a pass? Thanks in advance!
.BUT I can tell you I used the Rocker Panels off my 79 after I put ground effects on the car (20+ years ago) on my 76 which were a little scratched up....
IF there was a 1/4 inch difference in length I sure never noticed it..
Suggestion for you, I would go look at a vendor catalog, Corvette America, Ecklers, Mid America and see what year interchangeability is the 76 rocker panel. I think the 76 rocker panel interchanges with a number of years. but maybe not.
70-79 rocker panels are BASICALLY the same and are pretty much interchangeable with the exception of 78/79 being painted and the earlier ones polished.
The slight difference in length occured in 78 because of the optional larger 255 tires.
In 78 there were 3 different part numbers for them.
No. 1 was for use with the standard 225/70X15 tires and is the slightly longer one like used from 70-77, BUT with the painted finish.
No. 2 & 3 were for use with the 255/60X15 tires and were slightly shorter to accomodate the fender/rocker trimming that took place for the larger tires. Let's say no. 2 was for regular production and painted while no. 3 was for the Pace Car only and polished.
70-77 were the same. I think the length of the 78-82 panels is the same (shorter than the earlier units, but the bolt pattern is the same), but different years are painted differently.