Hi Mike,
Welcome to the Forum
Its a great place to find out all about your A10 and maybe even how to make an authertic Indian curry LOL
You have a rare version of the A10, I think most alternator models were destined for Police work?? (or is this a myth??)
There was a recent topic on this and even the peculiar wiring diagram showing the alt and dynamo working in parrallel
The clutch you need is indeed the cush type from an Alternator Triumph, this is basically the same as the 4 spring BSA, except for the centre that fits the shaft (different taper) and the plate hub with the cush drive
There have been several threads on varying depth of taper on the centres, and crap pattern ones with the oil scroll cut in the wrong direction
The engine sprocket should be a solid mount on the crank inside the alternator rotor, the rotor nut locks everything in place, some shimming may be required to align the engine and Clutch sprockets
I'm not sure where to go for the correct engine sprocket??? but I got one for an alternator B33 last year from Vale Onslows
I think the "F" is an inspecrors mark???
Dont know about the * mark ????
HTH
John O R