I put the '99-05 manual pull-out style towing mirrors on my '96. I had to re-drill one hole of the three. They didn't match the door contours perfectly, but close enough that they looked ok and worked very well! There is a downside... The passenger side glass is flat, not convex, so you can't see much. All the gm wide mirrors are this way so far as I can tell. Works OK with a trailer, but not so good for spotting lanes. The early pull-out mirrors had a built in spot mirror in them on both sides. The later ones only had it on the driver's side.
Chris