I think it will be eventually possible for this hub to be used for a direct-fit replacement HD slip-on 12" x 1.25" rotor--but the correct rotor doesn't exist--yet. It's being pursued, and will take some time....you'll hear more about it at the appropriate time. At least I hope so!
MAGS--Yes they can, but the rotors will need to be machined with the larger center bore and 5x5 pattern.
Were you looking for a 4.75" pattern? I would think they (KORE3) might offer that on a limited run, but the hub OD will probably not be reduced from 3.060--these are made with more material because the B/D cars are heavier.
James, the XLRv caliper, same as C6 PBR 2-piston, with a different paint job, is viewable here:
Bill have you had one of these in your hand yet ? Just wondering what you thought. Looks dang good in the photo. Now I need to see you about my rear c5 set up I may get this done before Indy WOO-HOO! Tobin sent an email that there will be a core charge on the reluctor rings.... so guys start saving your old rotors!
I can tell you that the standard KORE3 hubs for all other GM applications are 0.690" thick at the wheel mounting flange and this HD version is a full 1.00" thick. These are definitely "ruggedized", with roughly 20% more material overall.
I'll have a pair in my future plans for the Impala...working on another brake system "upgrade"...
Sleeper, that's one I can't answer--I suggest you have a conversation with KORE3.
The question in what you're considering that comes to my mind is what is the difference in distance between the inner & outer bearings on the knuckle for your application and the B-body knuckle? Even if there IS enough material to install the BR5, is the spindle (possibly) too long?
MAGS--they do make C5 rear conversion brackets, but the kit does not retain the park brake. I don't know if the KORE3 kit will fit the B-body. I suggest you contact them, or check it out on their website.
As far as rotor machining, I'd say in the $20-$30 range, maybe as little as $35 a pair, but it will vary by location, shop rate, etc. I could be way off...
If you're interested in what else is available for the rear brakes (what I'm using), contact me by PM or e-mail.