As a Buick 3.8 SFI Turbo super freak, I would love to share a few things. I have owned several t-types, and one Grand National. There are three versions of the t-type. There is a blacked out version with all black trim, and paint. It is the WE4 package. It is the GN in every sense except name, wheels, and two tone interior.
Next is the standard t-type. It was any Regal color, but with blacked out trim except the chrome bumpers. All of the above come with bucket seats, and console.
And finally the Limited T-type. It is almost as rare as the GNX. It came with features like vinyl roof, bench seat, and full Regal chrome with no black out trim.
If you have never driven a turbo Regal, I highly recommend it. I have owned three. One 87 GN, one 86 T-type, and one 87 Limited T-type.