I've put them in vehicles before. You should be able to drive the old one out and I usually pull the new one in. I usually just use a nut and keep tightening it to pull it tight, sometimes you may have to put a space under it so the lug nut has something to pull against.
Following along... See what Richard at Bro Tek says before you take other action. I have 2in spacers on the back and 1.25in on the front of my BX. Great products in my opinion.