Joe;
The Dimmick triggerguard that is sold by TOTW and a few others, is the right shape, but is too small. I bought one for a California muzzleloader, and it is a perfect match, but when I compared it to a genuine Dimmick that was at a local gun show, it was way too small. This guard might be off of a squirrel rifle by Dimmick, and not a plains rifle.
Hungry Horse