There are no drop in replacement parts for that gun, everything will need to be hand fit. I can not from memory recall exactly what the spring looks like, but a picture would help. Trggers pulls are mostly the result of sear angles and the relationship to the hammer bent. The replacement spring, if it is a close fit, should do little to alter you trigger pulls.
Steve

Firearms imports, consignments


[Linked Image from i.imgur.com]