This the reason I always buy my radios from Crutchfield. They include the wiring adapters and complete custom instructions for the car and radio combination. You might contact them and see if they will sell you the installation kit.

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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