Have New-in-wrap Heinie stainless magwell kit w/ a real nice Hogue double-diamond Coco-Bolo grips for it. (grips are checkered 20 lpi and relieved for ambi-safety too). Comes with instruction and dimensions.
The screws for the magwell are stainless also
Cocobolo Grips were handpicked w/ a darker finish for me which cost extra. Entire kit were purchased for a project that never materialized.