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5mm thread
If your tachometer drive housing is cast integral with the gear cover
and will fit ALL BSA and Triumph drum brakes of the vertical twin or triple models
after about '64 or so
They should fit all UNIT models of unit 500 or 650 twin until 1970
Triumph Pre-Unit Early Transmission Plug T400 pre-51 Ducati Memorabilia 5mm threadPerfect condition, thread fit and finish are perfect, guaranteed or your money back. CNC machined from aluminum billet. Not cast. Amazing quality!! Triumph's old part number is T400 (57 0400) for the transmission filler plug. These parts should suit the transmission of Triumph pre unit machines until 1951, and hasn't been available in YEARS. It will NOT fit later cases with the raised cheek next to the plug bore.
