Best Match 87-89 Smoke Gray Interior Paint?

the LMR one they sell matched pretty well but... if your interior is sun faded and old like mine then you'll obviously be able to tell a little lighter in color

You can buy SEM at any automotive paint store.

If I'm not mistaken I believe the LMR aerosols are now of the SEM brand.
*Unfortunately none of the aftermarket interior paints will match perfectly because of age, fading and discolorations of your interior. Every original plastic and vinyl part in the interior has aged differently and have gone different directions of color. Typically not too noticeable until you start repainting.
I've used the LMR smoke grey paint for years maintening my '88 vert and '89 Saleen and it matches the original color pretty good but not perfect.
More than likely you'll end up repainting more than you plan to.

The SEM is a good product as well and can be purchased at most local paint and body supply stores. I've used it on other vehicles. Works great!
SEM also has a great trim paint for the exterior trim of our Fox cars. Matches perfect.

Good Luck

I've used the smoke gray paint from LMR and it turned out good.