I recently acquired these GMC 18s, great condition wheels for an awesome price. Stock street tires but that will change soon.

I put two on the back and I knew I was going to want spacers, they sit in too much and look goofy. Unfortunately, they don't clear the caliper bracket on the front whatsoever. I was hoping someone could give me some insight on which size spacer looks best on 03-07 4wd trucks with these wheels. Are the simple ones at autozone enough? Or do I need to order certain specific ones. And if possible, what A/T tires look best on these.