All the GT panels will transfer to the SE. The space frame is the same on both. There are some underlying supports that must be transferred in order to mount the rocker panels and the strips on the doors. The egg crates underneath the fascias and some supports for the front fascia are needed. You would also need the fenderwell liners from the GT to make them conform to the wider aero section at the bottom of the fenders and fascias. Transferring the 86-88 GT rear clip requires a bit more work, including wiring harness, but the 85GT or 86-87 SE panels require nothing else.