I just did rear pads, rotors, and parking brake shoes on my '97 EB with a 5.0L and RWD. If your rear setup is a disk setup like mine, and you have the time to wait, I'd head over to RockAuto and order the same Centric 12065052 rear rotors that I got. They're $25.79/ea (plus shipping) vs $31.99 at Napa. Now, if your discount covers the difference between the price of the Centric pads shipped and what you'd pay at Napa over-the-counter, then go with the Napa parts. But for my money I'm fairly satisfied with the performance of the Centric rotors so far.
As for pads, I ordered the Centric 10506670 semi-metallic pads. Again, slightly cheaper than Napa pads and just as good quality, if not better. Again, the shipping might cover the difference but I'm happy with my choice.