This spacer 6FAI is suitable for Roland FJ-50 printers. This is the original Roland part (number 22165178).
 
Printer compatibility
Roland CJ-400
Roland CJ-500
Roland CJ-540
Roland FJ-40
Roland FJ-42
Roland FJ-50
Roland FJ-52
Roland FJ-540
Roland FLJ-300
Roland FP-740
Roland RA-640
Roland RE-640
Roland RF-640
Roland RF-640a
Roland SC-500
Roland SC-540
Roland SC-545ex
Roland SJ-1000
Roland SJ-1045ex
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-300v
Roland SP-540v
Roland VS-300
Roland VS-300i
Roland VS-420
Roland VS-540
Roland VS-540i
Roland VS-640
Roland VS-640i
Roland XF-640
Roland EJ-640
Roland XT-640
Roland XR-640