Superbird vs RR brakes

[oldcarnut]

The 70 RR I'm going to clone needs new disc rotors, calipers, etc.  When I searched for parts on-line I noticed a different part number for the rotors.  Whats the difference between the RR rotors and the Bird?  Are the calipers the same?  If the Birds are better or bigger then I would order them instead but they're actually cheaper sooo    For the RR it says Hub and Rotor and the Bird listed as just Rotor.  Does the RR come as a unit the Birds are separate?  I thought they were the same.  Can anyone offer some input on any differences and will they both fit the same spindle?  Thanks
1970 PLYMOUTH SUPERBIRD - V8-440 7.2L
WAGNER - Front Disc Brake Rotor  $167.99 Each  x   =  $167.99 
Item No: BD60230
O'REILLY     
WAGNER - HUB & ROTOR (72-69 CHR/DOD/PLY)  $180.99 Each  x   =  $180.99 
Item No: BD60252

[hemigeno]

To my knowledge, there was no difference in the brake rotor or other brake components between a Superbird and any other comparable '70 B-body. 

Personally, I wouldn't know about whether the Wagner components fit or function like they should, but I suspect some of the guys who haunt the technical sections might.  I'll move this thread over to that section so you can get the answer to the "real" question...

[oldcarnut]

Thanks, I questioned myself where to ask it at.  I want to order the stuff hopefully tomorrow so maybe someone here already has seen it before.  Maybe O'REILLY  can ask their supplier what the differences are if no one else knows for sure.
David