This is a brand oil filter with o-ring.

Part number: 99-1179, 19-4589, 19-4590, FB994/1

Fits: BSA B25, B50 from 1971 and up.
        Triumph single T25 from 1971 and up.
        Triumph Triumph TR7, T140 with upgraded sump plate designed to fit this filter element.

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