I was looking at putting some 15 inch rims and 31x11.00x15 thronbirds on my 99 HSE. I have a couple on questions. Are the break rotors on the p38 small enough to accept 15 inch rims. Can i mount these tires without a lift? This vehicle already has a coil conversion kit done and I plan on putting 2 inch spacers under the springs. The question is, should I do it before or after I buy the tires?