I am having the same problem many of you have had with heads fitting older drums.
My problem is finding a head to fit the snare side of a 14"WFL drum.
An Aquarian American Vintage head fits the batter side just fine. The snare side hoop diameter is the problem.
The head will fit over the shell, but the nickled hoop will not go down over the American Vintage drumhead hoop. Not even close.
Other heads will fit in the hoop, but not over the shell well at all.
The calf batter head that came with the drum fit very tight on the shell. The Ludwig plastic snare side head that came with it is still on there, because it was the best compromise, but it is way too tight over the shell also.
I don't have any other similar hoops to try, and even if I found a different companies hoop that worked, it wouldn't give me a permanent solution.
I think the best solution is to just bring it into someplace with a big selection of heads, and try them all.
Any other ideas or similar experiences?