I think what you have is a hide-head, you can have it made.

I think you're onto something with the hide head. I think the kit I have is an entry level German made Roxy. The bass head seemed odd to me but I didn't think they would put a hide head on a starter kit. Maybe it is. Only the front head exists. It doesn't have a rigid frame. It kind of wobbles around.

Any idea where to start looking for someone that does hide heads?

Metric head for a metric shell perhaps? 50 cm = 19.685 inches. Some Premier drums were in metric sizes as well.

Remo make metric heads. There may be some other manufacturers who do as well. And yes, one alternative is to have a custom made calf head done.

See this long discussion: http://www.vintagedrumforum.com/showthread.php?t=20326

I heard from Remo and these are all their odd sizes. Order through your local drum shop:

BA-0110-PR- Batter, AMBASSADOR®, Coated, 9-5/8" Diameter

BA-0112-PR- Batter, AMBASSADOR®, Coated, 11-7/8" Diameter

BA-0116-PR- Batter, AMBASSADOR®, Coated, 16-5/16" Diameter

BA-0210-PR- Batter, AMBASSADOR®, SMOOTH WHITE™, 9-5/8" Diameter

BA-0212-PR- Batter, AMBASSADOR®, SMOOTH WHITE™, 11-7/8" Diameter

BA-0216-PR- Batter, AMBASSADOR®, SMOOTH WHITE™, 16-5/16" Diameter

BA-0310-PR- Batter, AMBASSADOR®, Clear, 9-5/8" Diameter

BA-0312-PR- Batter, AMBASSADOR®, Clear, 11-7/8" Diameter

BA-0316-PR- Batter, AMBASSADOR®, Clear, 16-5/16" Diameter

BB-1120-PR- Bass, EMPEROR®, Coated, 19-5/8" Diameter

BB-1220-PR- Bass, EMPEROR®, SMOOTH WHITE™, 19-5/8" Diameter

BB-1320-PR- Bass, EMPEROR®, Clear, 19-5/8" Diameter

BD-0316-PR- Batter, DIPLOMAT®, Clear, 16-5/16" Diameter

BE-0112-PR- Batter, EMPEROR®, Coated, 11-7/8" Diameter

BE-0116-PR- Batter, EMPEROR®, Coated, 16-5/16" Diameter

BE-0216-PR- Batter, EMPEROR®, SMOOTH WHITE™, 16-5/16" Diameter

BE-0312-PR- Batter, EMPEROR®, Clear, 11-7/8" Diameter

BE-0316-PR- Batter, EMPEROR®, Clear, 16-5/16" Diameter

BR-1120-PR- Bass, AMBASSADOR®, Coated, 19-5/8" Diameter

BR-1220-PR- Bass, AMBASSADOR®, SMOOTH WHITE™, 19-5/8" Diameter

BR-1320-PR- Bass, AMBASSADOR®, Clear, 19-5/8" Diameter

CS-0312-PR- Batter, CONTROLLED SOUND®, Clear, 11-7/8" Diameter

CS-0316-PR- Batter, CONTROLLED SOUND®, Clear, BLACK DOT™, 16-5/16" Diameter

FA-0510-PR- Batter, AMBASSADOR®, FIBERSKYN®, 9-5/8" Diameter

FA-0512-PR- Batter, AMBASSADOR®, FIBERSKYN®, 11-7/8" Diameter

FA-0516-PR- Batter, AMBASSADOR®, FIBERSKYN®, 16-5/16" Diameter

FA-1520-PR- Bass, AMBASSADOR®, FIBERSKYN®, 19-5/8" Diameter

FD-0512-PR- Batter, DIPLOMAT®, FIBERSKYN®, 11-7/8" Diameter

PS-0110-PR- Batter, PINSTRIPE®, Coated, 9-5/8" Diameter

PS-0112-PR- Batter, PINSTRIPE®, Coated, 11-7/8" Diameter

PS-0116-PR- Batter, PINSTRIPE®, Coated, 16-5/16" Diameter

PS-0310-PR- Batter, PINSTRIPE®, Clear, 9-5/8" Diameter

PS-0312-PR- Batter, PINSTRIPE®, Clear, 11-7/8" Diameter

PS-0316-PR- Batter, PINSTRIPE®, Clear, 16-5/16" Diameter

PS-1320-PR- Bass, PINSTRIPE®, Clear, 19-5/8" Diameter

SA-0112-PR- Snare, AMBASSADOR®, Hazy, 11-7/8" Diameter

VA-0112-PR- Batter, Vintage AMBASSADOR®, Coated, 11-7/8" Diameter

VA-0116-PR- Batter, Vintage AMBASSADOR®, Coated, 16-5/16" Diameter

Surfcollector: the 19.5 is a German head size from the 60s.

I have a cheaper alternative for you:. Try a 20 inch TOM TOM head. They have a shorter hoop and most of the time the wooden hoop will sit on it just good enough for you to use the existing hardware with no mods. 20 inch Tom hoops aren't expensive, either, use Google. I used one on my Trixon 19.5 bass drum, worked like a charm.