The 6E54386400 O-ring can be ordered. View linked machines. 6E5-43864-00-00 is the manufacturercode.
The O-ring appears in these 50etmd 1990 parts lists:
PISTON SUB ASSY | 6E54382003
RING, BACK-UP 4 | 6E54387401
SCREW, TRIM CYLINDER END | 6E54382101
BOLT, WITH WASHER(6E5) | 9011906M42
BUSHING (6E5) | 9038618M14
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