Originally Posted by armorer951

Brownells has a MIM version of the 3rd gen hammer assy. you need listed under the 5906. You'll need to swap the stirrup from your current hammer to the new one.

5906 | Top Rated Supplier of Firearm Reloading Equipment, Supplies, and Tools - Colt

Used spurred hammers for 2nd and 3rd gen pistols are often listed on Ebay also.