Sorry for the belated response. I found the schematics at carlwather.de website in pdf. There is a part number for base plates, but you are correct. Trying to find them is a challenge. Yes, CSRs at Walther/Ft Smith are a bunch of rocks. Not sure if I buy another Walther just for that alone. Then again, the whole industry is getting that way.good luck finding a base pad, I have been looking for years with no luck, and calling Walther is like calling a rock, please let us know if you find a source.