Kimber 82 Parts

[28gauge]

Have a Kimber 82 All American Match that was aluminum pillar bedded some time ago. The front receiver screw does not thread directly into the receiver. It threads into a block that attaches to the receiver by a dove tail joint and then a lock allen set screw. This block's dovetail, had pulled away from it's female mate in the receiver some from torque (or perhams over torque). It appears that the metal on it must be softer than that on the receiver because the receiver joint is not distressed at all. My question is where might I be able to get my hands on this part?

Any thoughts, suggestions would be greatly appreciated.