This page will attempt to decode your engine number to give the original specification of the engine and gearbox.
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Guessworks Feature Product - A Series 3 synchro Layshaft
High quality EN36 steel shafts which have been heat treated to provide the correct hardening depth. A series profile to be with all 3 synchro transverse transmissions. This is the longer length so compatible with both Cooper S and Standard 3 synchro boxes.