Any grille from a pre-'90 for a Coupe bolts into supports in front of the radiator. They don't attach to the hood as the '90 grille does only. If you're looking for a '90 grille there's one on Ebay right now !
In my case.....when I rebuilt the '89LS....I made it into a '90 LS by adding the tail lights, wood grain interior, trunk spoiler and '90 grille. The body shop figured out a way to attach a '90 grille to an '89 hood. Good luck !
In my case.....when I rebuilt the '89LS....I made it into a '90 LS by adding the tail lights, wood grain interior, trunk spoiler and '90 grille. The body shop figured out a way to attach a '90 grille to an '89 hood. Good luck !