1964 - 1966 6 cylinder spindles, have a C3 on the back side.
1964 to 1966 V8 spindles, and have a C4 or C5 on the back.
1967 - 1969 V8 and 6 cylinder spindles, have a C6 on the back
1970 V8 and 6 cyl have a D0 on the back
1971 - 1973 have a D1 on the back.
Beware of C3 V8 spindles, Comet, look like 65 66 V8 and the C3 can be smudged to look like a C5, but the tie rod hole is wrong.
There is also a C9 that has the 1970 big pin, but the 65 66 V8 tie rod hole.
This does not include the various 1968 + disk brake spindles.
I current setup is a 3 bolt Granada disc spindle, I'm upgrading my brakes to a wilwood disc that requires a V8 4 bolt spindle. sorry for the confusion, I have been looking at way too many different spindles setup and no longer know which way is up
Start with what year mustang are you working on? 65-66 is one set, 67-69 is another, with an option for 70 on a 67+. all 67 are the same, but the 68 uses the 67 spindle for drums. Disc spindles 68+ are also different.
I am patiently looking for a 1965 or 1966 fastback to be used for a coupe conversion, ultimately becoming a vintage racer clone for myself. No need for title. I have a mostly complete 1968 convertible that I would be willing to trade. This is a parts car, no title, with many...