I just went to a salvage yard and saw a sweet 89 GTU and it had 2 perfect side mirrors. I have a 88 SE and was wondering what I am gonna need to grab and if it is possible to put them in my car. The mirrors were power ones and I have reg mirrors. The mirror switch was still in the car and is there a difference in console panels between S4 and S5's.

 

The mirrors will plug right into the door harness on a 88 SE.

You will also need the switch and a center consol panel from a car with power mirrors. the switch should also plug right in right under were your consol plate is currently located.

 

Don't forget...there is a "patch" harness that goes between the mirrors and the door panel harness. Most people forget this when they do the conversion, and have to go back to the junkyard.
Also, you will need the inner door "triangles" which differ on power window models.