Manchester

There are also two versions of the SBH hammer Midway sells. One is the assembly and the other still needs the plunger/spring/pin installed. Make sure you get the assembly if you want drop in.

https://www.midwayusa.com/product/1021569210?pid=848561 KMR04001B Assembly

I’ll take #5.

There are two birdsheads on gunbroker now.

Altamont offers a “slim” birdshead grip. No firsthand experience with ‘em. https://www.altamontco.com/pistol-grips/ruger/vaquerobirdshead/ they may be what you have pictured.