Oh, you want to install an adjustable recoil pad ... I've had three installed on three different guns, all in the US. All were excellent jobs, prices ranged from $165 to $200 US. They probably will be a little higher priced now. They will all probably sell you the hardware and pad and you can install it yourself, but they will all require grinding to fit. Two have web sites ...
Country Gentleman
http://www.gunfitter.com/
Mark Deprez
http://www.gunfitter.com/
If you want to contact them, use the telephone, since they travel to shoots.