The cruise amp is specific to the diesels. 1985 and up should use the same CC amp. An alternative solution is to send one off to JamesDean on this forum. He has the tools and know-how to resurrect them.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]