mec:
You appear to have posted graphics of a pocket .31-caliber or Colt Trapper. Seeing the brass trigger guard raises a question.
Cimmaron, perhaps other vendors, offer a reduced-size version of the Single Action Army. Usually, this is .38 Special, or some such. Will the trigger guard and backstrap -- these are steel, not brass -- fit on the Colt Pocket percussion revolvers?
I queried Cimmaron and obtain no reply. Could mean the question is ridiculous; or they have no idea; or they do not respond to E-mail queries.