Don't forget, for those of us who are much less-endowed financially, an affordable alternative is present in the 1.3" spacers from eBay seller
wheeladapters. I've had them installed for a month or so, including some wheeling, and no problems here... very solid product. Only adaptation necessary is to grind down the rear wheel studs a little bit to prevent them from sticking past the spacer and preventing proper wheel seating. Also, make sure that you use loc-tite on all the wheel studs to discourage loosening, and to retorque the wheel spacers a few weeks after installation. Do that and you'll be golden. Pricing is $149 for a set of 4, and mine are from 6x5 to 6x5.
-Phil