I know it's the incorrect one and I plan on getting the right 91/92 one at some point but until then, can you fix the sides of the wrap around spoiler? Mine looks warped? Not sure if you can see on the pic or not?

 

Search and you'll find many attempts with little success. There's an unpainted metal frame inside the rubber that eventually rusts, then bubbles up the rubber.
I think yours has the additional problem that it's not attached at the arms so it's really floppy.
To make it look better for a little while I would try bending the arms by hand to straighten it if possible and maybe epoxy it to the glass frame. The arm mounts for the correct wrap wing are different from the ones on that wing. Don't mess up the mounts on the glass frame since you need those for the correct wing. They may have been cut off by previous owner. You can also remove the third brake light and sell it. It's just screwed into the bottom of the wing. You may think it just looks better with no wing.

 

Yes, I went with no wing... 40 lbs of junk on my formy when I bought it. I got a hatch from a Camaro with no spoiler, just rear defog...