"T Type" was only availible in 1986, if my memory recalls correctly.
In 1987 Buick dropped the T-Type package on the Regal. All turbo Regals in 1987 came with the Y56 T package and have a T badge on the fenders and on the horn button (a similar T badge also appears on the current Regal Turbo and Verano Turbo). This T package is often erroneously thought to designate the Turbo T package, which is solely the WE4 Regal.
Just so you know.
There IS a difference, a big one.