We're installing McGaughy's 2/4 drop with spindles on my 2003 RCSB this weekend. The rear was easy. We moved right on to the front and now we may be stuck until monday. We've only managed to knock the heads off of the rivets on the drivers side which was pretty effortless with an air chisel and a grinder. We drilled through one but it took nearly an hour and it's still not completely drilled out. The remaining 3 rivets on that side seem nearly impossible to drill through. Anyone have any advice? This is the only thing holding us up.