Valve cups (bottom collar) for Inlet and exhaust valve, for Norton twins (each). 4 required per engine. If using head overahaul kit 050274 or valve guide 063527 this will Suit Norton 500/600/650/750/850 Twins 1949-75 & Matchless 750 G15 1964-68 with Norton engine NOS steel bottom valve spring cup (4 reqd). ID: 0.630" (bore); Thicknesss 0.15"; OD 1.35" otherwise use valve seat 067545 with 0.705inch bore for early guides. Original Norton part numbers: D12/148; T186; T2073; 06-1399; 061399 - valve collars/ valve spring cup bottom
