You can use '90-91 headlights in an '88 if you switch over to '90-91 corner lights and corner light clips. The headlight reflector/lens assembly can be swapped between '88-89 and '90-91 headlight frames, so I assume the projectors are the same way.
I bought a set of 88-89 projectors and swapped them over onto 91 frames. Since the projector part of the lense is "deeper", I needed to dremel out a bit of the frame with a cut off wheel to make the 91 frame fit over the back of the projectors.
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