Uh oh, another addict.
A lot of vendors who cater to us don't
just cater to us. Some cater to racers. Some cater to other "looks." Some are specialty vendors -- and some of them become surprised to hear from an air-cooled VW owner.
And, there are a lot of folks here who do their own one-off stuff.
A good place to start is to check out everyone and their rides here. People here are from all over the world. Where you're from will affect which vendors you might choose.
When you become focused on a particular upgrade, search it out.
All of the sponsors here are worth investigating -- even if they're not in the same country as you.
And by all means, feel free to ask any specific questions you want. This site has been tremendously helpful to me.
Welcome!