Mec
Dixie lists several parts for the Lincoln Derringer. The fly(GP4802), bridle(DP4803), sear(CP4714), trigger(YP4708), trigger pin(MP4709), forearm cap(MP4807), bolster cap(IP4808), sidelock screw(SP4701), hammer screw(SP4702), forearm cap screw(SP4704), lockplate/triggerguard screw(SP4705) and mainspring(TP0501). Most of the parts are in the $3 to $4 range and $6.95 for the mainspring.