Since this is being brought up soo much, Im going to make this a one shot deal with where you can get all the parts you need and all the options to lower your W-Body!
This will be for 1st gen W-body's, which include:
1988–1996 - Buick Regal
1988–1997 - Oldsmobile Cutlass Supreme
1988–1996 - Pontiac Grand Prix
1990–1994 - Chevrolet Lumina
First we will start with the Front Suspension of your car. Here you have a few choices.
1st - Held Motorsports Coilovers (Arraut