On front use re bump stops, the spacers will contact springs at full droop. I made the mistake thinking I could install after springs and had to remove them again to install. Used no spring compressor, jump removed shocks, sway bar and track bar (pita to put back in). For rear I used spacers. No bump stops in buckets as I'm waiting for my energy poly to come in. On fronts I drilled with a 21/64 bit first then used supplied self tapping bolt.