Got it, the cutout is much larger to accomodate the protrusion and looks 3 bolt instead of 4.

That is unfortunate,I'm aiming for bolt in only so if I can make it work it will have to be the regular gate shift with 722.636, it's a long shot but I wonder if the CLK55 ETC will except the anolog inputs instead of CAN, wiring diagrams show the anolog ETC terminals as "not used"... fun times ahead.

Shouldn't you be ruining porcshe owner conversions? =P