For your information, those parts are available from Brownells without the hassle.
Also, many parts for the Old Army can be used, and these are available from Brownells, also from Numrich (Gun Parts Corporation).
If you so desire, the Old Army grip frame can be fitted to your gun, and its all steel, but will require fitting and blueing. And steel ejector rod housings are offered, as well.
As to grips, CLC custom grips are superb. You might try http://www.clccustomgrips.com/