Hmmm......there are no *TGP* wheels unique to those vehicles, if you're referring to the optional 16x8 crosslace wheels those will fit all of the 1st gen W body cars.
Where a GP is concerned the front fenders for all the 1st gen models is the same fender, it cuts across the top of the wheel & does not completely enclose the tire.
Thanks for getting back well all I could do was answer one question of the leak points As in 5 years had no luck locating a P/W for an 89 regal coupe !, other than that its been a very good car ! as I know / seen this since new ! as I dread the people on CL ! lol. it would nice to see it go to someone who appreciate this group of cars at near 70 I am into the Y-body car 61-63 I need to spend time on my 63 cutlass conv. also know of the most mint one owner 94 regal coupe as my friend feels he's to old to care for it so that's up for sale too ! so let people know these cars deserve good owners Thank you for any help