Well, let’s try to make this a definitive guide on clutch boot comparison and differences, shall we?
I admit to being too fast in assuming that the opening in the four speed bellhousing would be the same as in the T9 bellhousing, apparently it isn’t.
I can supply you with an image of my installed clutch fork boot, which looks the same as Burton's item, but this is on a Ford T9 5-speed bellhousing. I don't have a type E four speed lying around, I do believe that that is the gearbox that was available in 71-74 2.0 Pinto’s.
I couldn’t find any picture of a type E with correct clutch boot, but there is a drawing in the 72 shop manual. It looks less elongated and the angle on the snout looks different. The number “7513” doesn’t get you anywhere, because Ford seems to use this number for every clutch boot they make.
If someone could make a nice picture of the real McCoy and post it here, we can prevent future Pinto fans from acquiring the wrong item.