www.Austin7Ulster.com › 5/16” BSF Barrel Nut - block to crankcase studs 5/16” BSF Barrel Nut - block to crankcase studs £2.50 5/16” BSF Steel Nut for crankcase studs 5/16” BSF Steel Nut for crankcase studs Add To Cart Added! You Might Also Like 5/16 BSF Nyloc lock nut £0.35 STD Top Water Manifold Cork Gasket (Low Compression Type) £0.75 Longer type Top Fan Pulley (Early Coil type engine) £39.99 Top Water Manifold (Low Compression Type) £15.99 Clutch Springs £8.50