Zenstat:So, I've measured the 3 1958 Sonor drums.The bass drum is 21 and 5/8 inchesthe snare and tom tom are both 12.5 inches so.....what do I do now?? Is the only answer expensive custom heads? Is there any 13 inch head that might fit? Did any company make their 13s a bit smaller? Maybe a Japaneese head?
Those aren't very close to an even inch size.
For the bass drum you are 3/8 inches undersized for a 22", which means a wooden hoop probably wouldn't be able to sit on the collar of the head and do the business. New wooden hoops are expensive so the custom head is probably the best return for your buck.
For the snare and tom you have an even bigger overhang problem with a 13" head. I've never heard of anybody making heads a bit smaller. They would tend to get rude letters from people who have standard inch drum sizes and discover their new heads won't fit. Usually the discussion is all about who makes slightly bigger ones to fit old Gretsch shells which are slightly oversized.
I've never heard of Japanese shells being anything other than standard sizes and spot on, but I don't pay very close attention to them.
Something I don't think we've established yet is do you have some standard inch sized heads on hand so you can try them and see? That will emphasize the tolerances you are dealing with. Of course you certainly don't want to buy new inch heads just to try them.
Sounds like custom is your best option. Good luck.