Norton ES2, Model 50 iron head engine barrel through bolts, head nuts, rocker box studs to suit Norton ES2 and Model 18 1946 - 54, Stainless steel. Original part number: 3680; A3/2 - crankcase cylinder stud 16555 - 1/4" BOLTS (26TPI) x 2 D3T/108 (C3/108) - 5/16" rocker box bolts x 7 A3/156 - cylinder head sleeve nuts x 4 19841 - barrel / head stud x 4 050241H - 1/4" washer x 2 050322H - 5/16" washer x 7
