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Yes. That said, I've found 2 bolt patters used on the t18 in fords, and 2 patterns on the bell housing.
1 has a longer input shaft and its bolts on the side on ears that stick off the front side of the t18 housing. this is an earlier style and uses the early style bell housing. (up to 64, plus later on some 4x4s)
The other has it's bolts closer to top and bottom, and a slightly shorter input shaft. it uses the later bell housing style. (65 and on, roughly.)