UP FOR SALE IS ONE (1) ORIGINAL CORBIN RUSSWIN 1 1/8″ MORTISE CYLINDER PLUG ONLY *MODEL (S) 121K11 (STANDARD) 487K11 (X CLASS) NOTE: YOUR KEYWAY WILL DETERMINE YOUR MODEL NUMBER. WE LISTED THE MODEL NUMBERS SO WHEN YOU SEARCH, THE CORRECT PLUG FOR THE CORRECT CYLINDER WILL POP UP NOTE: THIS IS THE PLUG THAT IS USED IN THE FOLLOWING CYLINDERS BELOW 1000-118-626 FOR 1 1/8″ CYLINDER HOUSINGS ALSO WILL WORK WITH MORTISE MASTER RING (JUMBO) CYLINDERS FINISH US26D (MESSAGE ME FOR OTHER FINISHES TO SEE IF THEY ARE AVAILABLE) MESSAGE ME IF YOU NEED OTHER CORBIN RUSSWIN PARTS MESSAGE ME IF YOU LARGER QUANTITIES THAN LISTED YOU CHOOSE THE PLUG FOR THE KEYWAY YOU NEED THESE ARE ORIGINAL FACTORY OEM CORBIN RUSSWIN PLUGS WE HAVE ALL ORIGINAL CORBIN RUSSWIN AND YALE PARTS FOR MOST LOCKS, PANICS AND DOOR CLOSERS AND MOST KEYWAYS WE ARE THE EXPERTS