This Bolt, Shoulder is suitable for Roland CJ-540 printers. This is the original Roland part (number 21815106).
 
Printer compatibility
Roland CJ-540
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland PNS-401
Roland PNS-501
Roland SC-500
Roland SC-540
Roland SC-545ex
Roland SP-300
Roland SP-300i
Roland SP-300v
Roland SP-540i
Roland SP-540v
Roland VP-300
Roland VP-300i
Roland VP-540
Roland VP-540i
Roland XC-540
Roland XC-540mt