the installation page (1 page front and back is the totality of instructions, but we will get to that in a minute..) says the calipers are 78-81 Camaro / firebird with 10mm connection. Rotors are 78-81 ECI / Camaro / Firebird style with 4.5 and 4.75 bolt patterns. bearings A2 outer A6 inner , National (GM) 8705S seal.
This is the $625 kit, with $50 worth of short brake lines from caliper to frame.
2 rotors
2 loaded calipers
2 aluminum hubs
2 1/4"-thick steel plate mounting brackets
a sack full of bearings, bolts, and misc.
The $50 extra got me 2 raybestos lines in another bag.