FIRST EXHAUST STOCK OF OLD PARTS UP TO IDENT NO.5 339980 WITH 10/50 ON RIGHT SIDE OF VEHICLE; MUST NO LONGER BE INSTALLED WITH 20/60 ON LEFT SIDE OF VEHICLE FIRST EXHAUST STOCK OF OLD PARTS UP TO IDENT NO.5 339980 WITH 20/60 ON LEFT SIDE OF VEHICLE; MUST NO LONGER BE INSTALLED WITH 20/60 ON RIGHT SIDE OF VEHICLE