This Stopper, Cam Cm-500 is suitable for Roland CM-500 printers. This is the original Roland part (number 22135346).
 
Printer compatibility
Roland CJ-400
Roland CJ-500
Roland CJ-540
Roland CM-300
Roland CM-400
Roland CM-500
Roland CX-300
Roland CX-400
Roland CX-500
Roland FJ-40
Roland FJ-400
Roland FJ-42
Roland FJ-50
Roland FJ-500
Roland FJ-52
Roland FJ-540
Roland FJ-600
Roland GX-640
Roland SC-500
Roland SC-540
Roland SC-545ex
Roland SJ-500
Roland SJ-540
Roland SJ-600
Roland SJ-640
Roland SJ-645ex
Roland SJ-740
Roland SJ-745ex
Roland SP-300
Roland SP-300i
Roland SP-300v
Roland SP-540i
Roland SP-540v
Roland VP-300i
Roland VP-540
Roland VP-540i
Roland VP-300