I love these from Bell & Carlson still a great bargain at $300. Inflation !
A shim can be found or made to make this fit the 2-piece bottom metal.
I have one on a 1990s M70 Classic that I converted from .416 RemMag to .458 WinMag, with 1-piece bottom metal.
https://www.bellandcarlson.com/index.cfm?fuseaction=category.display&category_ID=1082