Valve cups (bottom collar) for Inlet and exhaust valve, for Norton twins (each), 0.705 in bore suits early guides. 4 required per engine. This will suit Norton 500/600/650/750/850 Twins 1949-75 & Matchless 750 G15 1964-68 with Norton engine . Original part numbers: D12/148; T186; T2073; 06-1399; 061399 - valve collars/ valve spring cup bottom
