Sorry I was not realizing what you meant. Generally firing pins usually match, I would have to look it up for some years, but a 1921 would have a matching numbered firing pin. Now this is just my opinion, but a firing pin is liable to break, more so than many parts and is more liable to be incorrect or a non-numbered part...
You need to check with Tom Heller or others, check e-bay for firing pins. Maybe do a swap, if you say what number yours is, it might spark an interest?
Ed