This is all I know.

Cruise control amp on gas and diesel cars most likely are not compatible.

Some older model years 190D, 300SDL, 300SD cruise amp are compatible.

Older model 300D seems to be different from others. The best way to find out is to look up the part # of the amp for the cars and see whether they match.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.