Have you had any luck yet? I need 2 rear sights too. I bought a PR45 to transfer some parts to my PR15 which is no longer made. The adjustable sight was one of the parts as the PR15 just has a fixed sight site. Unfortunately I damaged it when removing it. BTW you will also need a 2mm x 15mm long bar to retain the rear sight in place. This portugese site has a minimum order quantity so we could do a 'group buy' if you want..?