These exhaust tips were custom made to be correct for 1970 Corvette . They are in new condition and never installed . These are not the thin light weight reproductions that are commonly available . These are as the originals with no part numbers correct for 1970 . They have flash chrome that the judges are looking for . These should be 100% correct for NCRS judging . They will work on 71,72,73  but I am not sure how they will judge them on the later years .