Brad L-
Since you are sticking to originality, if the front Simplex your friend sends you has a red disc on the body lubrication port it's a Prestige. Typically, PX 10s had Criteriums front and rear and your front Criterium will have a chrome plated alloy band the the silver coloured disc on the body. Pry off the red disc from the Prestige, squirt lube inside the derailleur body, swap out the Prestige dull alloy for the Criterium's chrome attachment band and, viola, a "new" Criterium replacement front derailleur. Check the hub bearings carefully. The Competition Luxe use a unique cone design contour and if over tightened will pit and be almost irreplaceable. Adjust carefully when re-lubing. A 37T inner ring is available from Red Clover:
122 BCD Conventional Chainring, 37 Teeth