They will fit, but i think they mount differently. You may need to swap out to the '91 and back style of bolts and clips for them to work. I know my 85 just uses screws to attach the trim, whereas the 92+ uses push pins.
The mounting clips are different. The 88 will have round holes for the trim to clip in, 92+ has slotted holes for the fasteners. Made it a PITA to go with some removable fasteners that I had bought (that split open in 2 directions to lock in place) as they would rotate and pop out on my 92. Just snatch the mounts out as well if you can to save you the trouble on the fasteners working right, as the locations are the same between body styles and be prepared to fight the bolts on your old top (particularly to the rear) to get them. Alternatively, could bore out the holes on the 88 trim to fit fasteners instead of screws.