I have an Old Model BH, .357, Ser.# 31-36xxx. (1972) 1 of 735 issued with the MR-3DB Dragoon frame. When I acquired it some 30+years ago, the original frame was changed to an XR3-RED, and the entire gun was Armalloy coated a flat gray or silver. I am now restoring as much as possible, and keeping it. I need a little help in locating a brass MR-3DB. Maybe brass ejection rod and cylinder pin, also. Any and all suggestions appreciated, thank you.