This Saddle Set, Locking Wire Lws-1211Z 20P is suitable for Roland RA-640 printers. This is the original Roland part (number 31409811AS).
 
Printer compatibility
Roland BN-20
Roland FP-740
Roland LEC-300
Roland LEC-300a
Roland LEC-330
Roland LEC-540
Roland LEF-12
Roland LEF-20
Roland LEJ-640
Roland RA-640
Roland RE-640
Roland RS-540
Roland RS-640
Roland VS-300
Roland VS-300i
Roland VS-420
Roland VS-540
Roland VS-540i
Roland VS-640
Roland VS-640i
Roland XR-640
Roland SP-540v
Roland FJ-540
Roland SJ-540
Roland SJ-640
Roland SJ-740
Roland XF-640
Roland AJ-740
Roland AJ-740i
Roland SG-300
Roland SG-540
Roland VG-640
Roland VG-540
Roland EJ-640
Roland RF-640
Roland RF-640a
Roland XT-640