The ones I got were like 11 inches wide. Just don't get the ones that are 9 inches cause they want be wide enough. Ebay was the cheapest place I could find them. Where do you plan on moving your fuse box and computer to?
If you want to take your inner fenders out and put trailer fenders in there you will have to relocate the battery, overflow tank, and fuse box or make brackets for them to fit. I wouldn't think you would have to tub it for 20's. I had a 01 ext cab lowered 3 in the front with 24's and all i did was roll them up a little on the inside and it never hit in the front. I would lower your truck throw the rims on there then if it hits try to roll it up were it hits.
I plan to sandwitch it between the brake booster and battery. Basically up 2-3 inches, forward 3-4 inches and toward the motor about 4 inches. I have an EDC, so its going to be tight. After checking out the above link it looks like I going to need to mod the slides and bottom portion of the box too. Going to check out EBAY for fenders now. Thanks
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