The 6E54386300 O-ring can be ordered. View linked machines. 6E5-43863-00-00 is the manufacturercode.
The O-ring appears in these Pro 50h 1987 parts lists:
PIN, LOWER SHOCK MOUNT | 6E54381800
PLUG, RESERVOIR | 6E54382900
PISTON, FREE | 6E54381401
BUSHING (6E5) | 9038618M14
RING, BACK-UP 2 | 6E54387200
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