Next Product $3.50 Oring for crankcase breather tube assembly. 550, 550A, 547/1, 692/0, 692/1, early 692/2. 50 in stock 547.01.138 - Crankcase Breather O-Ring quantity Add to cart Category: Engine Related products Quick View Quick View W25EN – Nippondenso spark plugs $190.00 Quick View Quick View 539.01.130 – Sump plate gasket $4.50 Quick View Quick View 547.03.102 – Wrist Pin Bushing for Roller Bearing Crankshaft $500.00