1 1/2 inch spacers up front on my tracker required slotting the top strut holes. I had a set of the adjustable camber bolts... but they couldn't get the alignment back to specs using them... so the top bolt holes got slotted a little. The camber bolts are a waste of $ IMHO. There is probably something to be said about the thinness of the metal on the camber bolts as someone mentioned in the thread above as well. It's now been 20K miles since install, still drives straight, tires are wearing evenly, etc, and I have not been back for a follow-up check on the alignment.