1988 Gt

Just the spoiler, however, they won't interchange easily. The LX spoiler has holes all across the hatch, while the GT spoiler has holes just on the edges. Also, the LX hatch tends to not be painted under the spoiler. I think they did start to paint them around 91 or 92.

SO yes, the hatch will swap over, you'll just need to live with the LX spoiler.