Will 90 vert doors work on my 88 T-top?
 

I found some vert doors on a 90 GT in real nice shape. My doors are banged up and were mangled up inside by the previous owner. I know the doors will fit, but will the window roll up all the way and conform to the body?

I dont see why not. They should work.

the hard top doors have the frame over the window which completes the seal. The vert doors wont seal properly because the seal system is different. The convert top has a seal on top that the glass rolls up into.

If you can find a set of vert doors from an 87 and some 88's you might be able to use them if you swap out the glass. I am in the same situation with my 86 T-top. The 89-93 vert doors have the mirror mounted on the door skin itself as opposed to where the 85-88's had them mounted. I want to swap because the 86 doors don't have speaker holes. I already swapped the mirror's and up trim so that my 86 doors look like 87-88 doors but I am still looking for 87-88 vert or T-top doors.

FWIW, I have heard the doors will work, but the windshield rake is different. You will need to retain the T-top windows, regulator, etc. One alternative I have heard of is to cut the frame from a non-T-top door, and use all the trim from the original door.