That's a 76 part number (D6ZA), so it should fit your MII. I'm not sure of the dimensions as the listing posted Ford Truck as well. Does the seller know what it came out of? Either way, the opening for the transmission will have to be machined to make it larger to accept the T5 and you'll have to have a spacer made for the input shaft bearing that's in the end of your crank, unless you're using a 94-95 T5 which is supposed to have a longer input shaft. Go to www.mustangii.net
and look in the Tech Section as there is a very good how to article on installing a T5 using a MII bell housing.