(7521) Correct contour insures a good fit, 12 1/2" long. This is for both 3 and 4 speed cars. Check out the comparison picture with the off-shore crapola rod sold by most vendors. The only reason you replace this rod is that it is wore down in the area where the bushing seats. Unfortunately when the Chinese were given a sample to copy they must have been given a worn out one! The one on the left
(made in USA) fits tight with the bushing and was copied from a NOS sample. Replaces Ford Part #: C7ZZ-7521-A.