I found not only mine but a extra one in my road runner Vin is R P 23 M 2 G 1 8 6 2 9 1 this could be your lucky day but I highly doubt find original owner any help would be apreciated

Body Type: R = Plymouth Belvedere/Satellite
Price Class: P = Premium
Body Type: 23 = 2 Door Hardtop
Engine: M = 400 190HP(net) 1-2BBL 8 CYL
Year: 2 = 1972
Sequence Number: 186291 = 86291st Vehical Built