Both SEM sprays (there is a "old" and a "new"; one's got more flex) are available here:

http://www.vinylpro.com/

I use paint thinner or acetone or alcohol as a prep AFTER TESTING A NON-VISIBLE AREA of the part. Not recommending this, just telling what I've done. Acetone dissolves a lot of the materials we want to color!!!

The carpet dye on this site (different than the SEM aerosol) worked ONLY for touch-up; not a particularly great product.

The 1980's Mercedes MB Tex grey is #15393 for inquiring minds.

Wrecker's yards love SEM because they always, somehow, manage to have YOUR color "in stock" (at a slight premium, of course).

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)