This is a replacement black box for your Boyer Bransden 12 volt Electronic Ignition, as found on Triumph, BSA and Norton twin cylinder motorcycles, as well as Triumph and BSA unit-construction, single cylinder bikes. Replace your fried or damaged black box and save money without having to buy an entire brand new ignition. OEM # CBS-3576A

Note: There are no returns on carburetors, electrical items, full frames, hardtails or made-to-order items (such as magnetos) unless there is a manufacturers defect.