I picked up the complete bumpers with impact bars and the head lamps with the idea of putting them on my 89 formula. i have everything there to install them and the only thing needed is to paint them.
however the more i look at my car im no longer sure if i really want to switch the the 91-92 formula bumpers and head lamps and Im wondering what they are worth.. I know they are very hard to find now

 

So you are thinking of the 91-92 nose & tail on your '89? Do it . It looks so much better than the pre-91 look. No ugly black bumperettes, clean look, the banshee style openings that look like a '77-'78 TA. The car looks more modern with the smaller headlamps also. Plus it sort of resembles a C5.