Do you have one serviceable one?
Note: I can't tell much from the drawing so I'm kinda just guessing here. Is the firing pin the sort of thing that you could take to a machinist/gun smith and have made? Might be a bit easier. If you order an off sized pair, you may still need a machinist/gun smith anyway.
I would also recommend asking one of the moderators move this to the Gunsmithing forum, better target audience.
Greg USAF Retired NRA Life Member "If you put the federal government in charge of the Sahara Desert, in 5 years there'd be a shortage of sand." Milton Friedman