Sorry, did not mean to give you a snappy response, was suddenly pushed for time here. Yes, many are interchangeable, shapeable, fileable, etc. Assume this may be a leaf style spring found in many muzzleloader locks? If you can find a real honest to God gunsmith, he should be able to replace the spring for you- especially if you have the pieces of the old one. Bending and tempering springs is a "stock in trade" thing for a smith. Not a parts replacer, but a smith. There is a difference. You may not find a "drop in" made for your brand, but If you can check with Dixie, bet they can find you one that is close enough to be fitted. "Track of the Wolf" is another muzzlelaoder source worth checking.
What we have here is... failure- to communicate.