You could perhaps successfully dye leather.

At best, you could only coat MB Tex and I would not even try it.
Keep looking at the pick -n - pull for the blue. It should not be hard to find.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386