build one! I did.
check out my pics on the muzzleloader pics thread.
order a complete small siler lock...it's cheaper that way. use the pan, frizzen, frizzen spring, and hammer. They fit right on the T/C lockplate with minimum fuss. Mark your holes then drill and tap. The barrel is another story. Use a T/C 15/16 breechplug and mill or file it down to fit.