When I say W-Body, that means the platform that all Grand Prix'*, Oldsmobile Cutlasses, and some Buick cars are built on and use very similar brakes/suspension/misc parts. We are a H-Body but the GM parts bin is basically GM has already designed over the years many different parts. For example, rather than GM making 6 different brake systems for 6 different cars on the same platform or similar platform, they make one which reduces cost and makes it easier for people like us to get parts for our car. You can get the Powerslots from www.autosupermart.com
, or just type a search on Yahoo like "Grand Prix Powerslot rotors". Something like that and there are a bunch of different companies that sell it so check who has the best price w/ shipping. I got mine for $200 shipped. If they fit on my car, then they will fit on yours.... so it'* really unneeded to question if they fit or not. The part #'* for them are
8257PSL & 8257PSR
I dont know what your Bendix pads will do with the Powerslot rotors. You have to tell me what material they are and you need to match them to slotted rotors. I love my Performance Fricition Ceramic pads I got from AutoZone. I ate one of my rotors (made my own slotted rotors :P ) so I just got better ones. I dont like OEM rotors because they warp way too easily and its so annoying to have that extra unbalancedness (i know not a word too lazy to use "modern" english lanugage descriptions) in the tires/wheels when driving the car. I hope that answers all yours questions and if you have more, just post here.