I want my tires to....
Thank you for saving me a world of trouble. lol.
I'm not sure what year truck you have, but below is a link for wheel spacers for my year truck (2002) and my bolt pattern (5x135). But as stated earlier, you might want to read up on this before you do it. I have no personal experience, but in my years on this site, I have read they are not safe. However, I have not read of any real proof\experience as to why they are not safe, it just seems to be a common response when this question comes up. Good luck. 
http://adaptitusa.com/

http://adaptitusa.com/
Ive considered them. Ebay has some good selections. There are a lot of portugese running them on Chevy's and I have yet to hear of a spacer related issue offroad.
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You DO NOT WANT TO USE SPACERS if you drive any at all on the highway or offroad!!! I had some Keystone Classic rims on my old '67 Chevelle SS that weren't exactly the bolt pattern for the car. I bought the correct bolt pattern spacers and put them on my car. About three days later, I noticed a shimmy in the front end, got home and pulled the driver's front wheel off, and theose spacers had sheared four of the five lug nut bolts off! The wheel would have come off very shortly if I hadn't checked. They were torqued to specs according to the directions with the spacers, but still came loose and almost caused MAJOR problems. Don't get spacers, PERIOD!!



