My local dealer has never known anything about any kit - ie the top end cleaner/solvents you might have read about from Gettel, hub rebuild kits, any kit.

The FSM lists 2 c-washers, 1 e-ring and 1 gasket per side as non-reuseable.

The first time I did mine after having different shops in and out of there for the first couple years of it's life I found no gasket (afaik it's just paper), and I was able to reuse all but one of the 4 (talking both sides now) c-washers. I did pinch them back closed a bit and flatten them back out in a vise. Both e-rings were fine. The retaining cups were fairly wallowed out, and once the one blew and locked up the shoe, I replaced all 4 on that side and held on to the other 4 in case.

So, if you want everything on hand that could be rendered useless:
4 c-washers, 2 e-rings, 8 retaining cups, 2 gaskets, 2ea fr/rear shoes. I guess you could also replace the pins that feed through those hold down cups (4 total), but they seem to take the r&i abuse better than the cups.

And of course, try hard enough and you can render any of the parts useless, but the hard parts are pretty hard and the springs pretty stout.