I updated my post above with and additional tip on how to make sure the NSS is in its proper position for it to function properly. Basically, it needs to be slid over to the left while in Neutral gear, bolted down and then tested in both Park and Neutral gears.

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio