You don't need $20 to get in contact with him on gunsnet, anyone who logs in can send a PM. Do a search for Pistol Trunnion and lots of threads will come up from the for sale forum. Then send him a PM. He only charges $40 shipped, and it comes with the swivel, and fits nicer than the one AZEX makes.
AZEX charges $60 plus shipping and no swivel. I know, I bought one and he shipped it to the wrong address and then told me I gave him the wrong address. Yeah right... anyway. Good luck.