H&R 650 Cylinder

I have an H&R 650 revolver with the 22mag cylinder. It originally came with a 22lr cylinder also, and I am trying to find one. The one I have has the nickel finish, but I'll also take a blued finish 22lr cylinder for any of these models: 642, 649, 650, 660, 676, 686. I have tried all of the normal parts places, so I am trying some of the cowboy action forums thinking ya'll might have a lead on one. Thanks in advance.