Not sure I understand the question. But, here goes. I get some of my tires from my dealer just because he can install them. I actually do not keep any spare parts on hand. I did install some things like saddle bags, luggage rack, crash bars and such. You will know as you go along.
If you can get them installed you can get a good price on tires and batteries from "shadetreepowersopoerts.com" They are a place close to me but there are lots of good places.