Isolastic mount thrust washer for Norton Commando, (each), four required , 2 on front and 2 on rear . Suits Norton 750 & 850 Commando 1969-74. The bronze loaded PTFE washer is preferrred see BT-064748. Original part number: 0653556; 060578 - front engine mounting washer (polyurethane); rear engine mounting washer (polyurethane)