are there any major differences between 65-66 mustang upper control arms and maverick upper control arms, back when I replaced my uca's I ended up using the 65-66 uca's, compared to my old ones they looked exactly the same. Ive also been reading that 67-68 are the ones that are the direct fit on a mav.
67/68 are direct replacements for a mav...And...You can get em with 4 bolt ball joints as opposed to the typical 3 bolt joint common to mavs'.Not a big deal but... Havent personally used the 65/66 ones though. Cant see there being a real difference, and since you have allready used em with success, I would imagine there isnt a difference.