Am looking to possibly use a 25mm modern Weihrauch piston seal (with the internal - thus female - dovetail) in restoring another gun with 25mm cylinder.

My two questions are

1. Does someone have the precise dimensions of the piston dovetail (the male part) as I'd need these to machine the external dovetail on a replacement piston?
2. And what is the length of the Weihrauch seal?


Thanks.