The grips on the e/37 Sauer were purchased as reproductions, although the left grip may be original. The right grip is made of resin, not plastic, so I am reasonable sure it is a reproduction. The grip screws I am using right now are the narrow ones for wooden grips. The pistol originally came with ersatz wooden grips which are supposedly period correct, but they are clearly hand made and fitted to the pistol.
I'll check out the CDS Carbine site to see what they have to offer. Thanks.