Everything I've read says the rear wheel is a direct bolt on to the early (75-77) wings. My 76 was done by a PO and "I was told" when they tried to install it, the final drive would bind on the wheel. Their solution was to swap the final drive as well. I haven't read of anyone else having this problem, but as there were 4 final drive part numbers used on the early wings, I would suppose it is possible.
As for the front, if you unbolt the front wheel from a later 1000 (78,79), and transfer the whole assembly (wheel, rotors, and speedometer pickup) to the forks of an early 1000 (75-77) it will bolt right on. The only problem is the rotors on the comstar wheels are fractionally closer together than the rotors on the spoked wheels. To compensate I have a washer on each brake caliper mount bolts between the fork slider and the caliper mount. Trial and error to find the right thickness to line up the calipers with the rotors.
Washers on caliper mounts
Rotor lined up with caliper
76 fork slider with a 79 comstar mounted
78 slider with a 78 comstar mounted notice how much closer to each other the caliper mount bolts are
I see WF is on the ball with his pics. Oh, well here's some more