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M Part number is CBS-5010
cap and the correct fiber washers
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BSA Pre-Unit Primary Cover Gasket 42-7507 (1) 68-0473 M Part number is CBS-5010New English Made BSA Pre Unit Singles & Twins Primary Gasket. Stop annoying oil links by installing a new primary cover gasket. This primary cover gasket is compatible with models that feature the swinging arm frame. Replaces BSA part number 42 7507. Fits BSA pre unit twins (A7, A10, Goldenflash, Super Rocket, etc) from 1954 1963. Also fits BSA singles (B31, B32, B33, etc) from 1954 1957. Please refer to your parts book to ensure the best fitment.
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