I installed them on my 05 back in August. They are mostly bolt on as you only have to drill one hole on each side. I want to say the holes are between 1/2" and 3/4". If you don't plan on wheeling it right away, the bolts will hold it all in place till you are equipped to drill. I mounted mine with bolts only for over a month. When you do drill, definitely get a step bit, as it will make it much easier for you. Jim's included instructions are very easy to follow. Goodluck and they are well worth the investment.