Technical Wittek part numbering

Does anyone know the secret to Wittek clamp parts numbering?

I see many witteks stated as #36, FB11, FBC14 and so on...

Is there some resource that helps decode these so I know the hose size they work with?

 

Bump - I'd be interested in knowing this too.

 

Hey Mike, didn't realize this was you! Got your email, thanks...

 

So would I x2

 

Hey Paul! I didn't realize it was you either!

 

weekend bump, anyone?

 

Found this:

http://antiquetractorblog.com/tag/wittek-clamps/

 

Thanks, shame they don't do them smaller for gas lines and with the "thumb" end v the bolt head.

I am looking for 6 of them to clear my list...