Starting in 67, the fork lock moved to the top of the steering head....there is a flange on the top of the casting with a hole in it. The 66 and earlier frames had the fork lock on the left side of the steering head, about in the center.
It's not uncommon to have rear frames not match the year of the main frame. Starting in 68, the left side panel is retained by two pins on the rear frame downleg and a knob on the upper front, with a tab welded to the rear frame just to the rear of it's top mounting point to the main frame.
65 was the only year which saw the crankshaft located by the LEFT ball main bearing, all others locate the crank by the RIGHT main bearing. When Triumph changed to a roller LEFT main bearing the next year, they went back to the old system, so the internals of the 65 are unique. For me, I would fit the roller to the left and use non-65 spacers, sprocket, and pinion. Just because the factory makes a goof doesn't mean I have to.
[ This message was edited by: Mecchanica on 2007-07-12 11:32 ]