It is nearly useless looking for mounting rings that will fit to given bases.

Though the mounting parts all look alike they differ in details, because they were individually fitted together and moreover fitted to the scope.

So if you will use the period correct claw mount, the easiest way is to replace the front base together with a prefitted front ring ( Recknagel, EAW , MAK Kilic ) and for the back base - square bridge mounting system and the normal Suhl type require the same procedure- milling the foot out of the raw part ring base which are produced by the same companies.