So I have a 98 k1500 with a 6 lug 14 bolt rear end and JB6 brakes. I'm looking at switching to the JB7 calipers (pn: 18-4123) and the JB7 master cylinder. (pn: 131-66008) My original plan was to switch to rear disks but @Schurkey made some good points in a couple different threads about those...