BSA M20 M21 B31 B33 Sidevalve Engine Stainless UNC Hex Allen Bolts BSF Nuts Kit

500cc & 600cc sidevalve. BSA M20 M21 B31 B32 B33 B34. Comprehensive kit of 44pcs UNF/UNC Allen screws & BSF nuts for engine covers. BSA B33 1947-60. BSA B31 1945-59. BSA M21 1937-63. Pressed Steel Chaincase models: BSA M20 1937-55.

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