the outer bushings between the fxt and sti diff carrier looked identical to me. the opposedforces illustrated breakdown does not list the part #'s for the fxt bushings. the fxt illustration of the bushings also differs slightly from the sti illustration of the bushings, so who knows maybe they are slightly different.
the part #'s i'm finding for the sti bushings are:
i'm pretty sure you'll need 1 of each, but i don't know which is left or right lol.