If you're going to try to patch the tires yourself or have them patched, I would only run them on the back only. If you had cords cut the tire could be unstable. You only have two or possible three (D,E range or competition tire), a 1 inch slash should have cut all three. Patches aren't meant to flex like a sidewall does. And you're going to need a tire bur, a die grinder, a scraper, and pre cleaner, Not just a patch and cement. Recap shops reject casings that have cord damage to the outside if the tire, and won't touch any casing with sidwall damage. There's a reason they don't. If you're looking for 17" rims, how were they bolted to your XJ when they were slashed and have fitment issues? Did you buy slashed tires?