This Bush, Nb-8 is suitable for Roland XR-640 printers. This is the original Roland part (number 31029105).
 
Printer compatibility
Roland CJ-540
Roland FJ-540
Roland FLJ-300
Roland FP-740
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland LEC-540
Roland LEJ-640
Roland SC-540
Roland SC-545ex
Roland SJ-1000
Roland SJ-1045ex
Roland SJ-540
Roland SJ-640
Roland SJ-645ex
Roland SJ-740
Roland SJ-745ex
Roland SP-300
Roland SP-300v
Roland SP-540v
Roland XC-540
Roland XC-540mt
Roland XJ-640
Roland XJ-740
Roland XR-640
Roland XF-640
Roland XJ-540