Baer offers a 12" and 13" brake upgrades with PBR cailipers for a II with 4 or 5 bolt patterns. They also offer rear disc brake kits 4 or 5 bolt also. I am going to go with a 5 bolt kit when I do it. 4 x 4 1/4" is a dead bolt pattern, especially with the required 16" and 17" wheels for the big brake kits. The speed shop I work at is a Baer distributor, but it begs the question does a 2800lbs car need 13" front brakes??? I like the sound of the Heidts kit, because I want some major woe, without having to go with 16" or 17" wheels. Has anyone conducted any 60mph to 0mph with the various brake upgrades? I am curious how much better the upgrades are compared to the dismal stock 190' to 170' stopping distances from 60mph. Given on a modern set of wider tires those distances would lesson, but the II's braking does not compare with modern muscle cars.