This is a reprint of the original factory 650cc Unit Construction Twins parts manual number 3, printed 1964. It covers the 6T Thunderbird, TR6 Trophy and the T120 Bonnevillle 120 Models. From Engine No. DU13375. It also includes a parts supplement for Thruxton Bonneville T120 High Performance Specification. It shows the whole bike in exploded view and the part number for every individual part. An indispensable item for any Triumph owner.