I'm sure 69MyWay is talking about wheel adapters and not spacers. You could need them as thick as 2" and spacers over about 3/8" are not a real good idea. Adapters though bolt to your existing wheel studs and have their own studs mounted in them that the wheel bolts to.
Do a search for "wheel adapter" using www.google.com there's a lot on the web on them...
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