I ended up purchasing the Motegi MR-116 with a 5x100/4.5 bolt pattern.
The 5x115 Grand Prix bolt pattern I have on the rear wheel hubs proved to be impossible to find offsets and rim widths at a reasonable cost , so I re-drilled the 5x115 GXP bolt pattern to a Mustang 5x4.5 bolt pattern.
I purchased a 94-04 Mustang wheel bearing off ebay and made up the 5x4.5 drill guide out of 3/8" plate.
http://www.ebay.com/itm/1-N...essories&fits=Model%A search revealed this website that sells Wheel Bolt/Lug pattern drill guides. More than I wanted to spend though.
http://store.roadkillcustom...5-5-x-5-50-to-5-x-5/After I disassembled Mustang hub, I turned up some 1/4" drill guide bushings and secured them with Loctite.
Half of the 3/8" plate width is bored to match the Mustang hub, the other half bored to match the Grand Prix hub, then clamped and drilled.
The plate with the 4.5" bolt pattern clamped to the Grand Prix hub and pilot holes drilled.
Drilling out the pilot holes with a 12M drill for the wheel studs.
Since re-drilling Grand Prix hub was an after thought, I was stuck with working around the 3/4" bearing flange bolt access hole.
Wheel studs installed.
Wheels mounted
Rear wheel to fender.
Rear wheel to coil over and trailing link clearances.
Front wheel to fender.