As apposed to using Porsche oem stuff; why not just buy an aftermarket unit?
 https://www.ebay.com/itm/Rostra-250-1223-Aftermarket-Add-on-Electronic-Cruise-Control-Kit-3421-Handle/400282015254?hash=item5d32aad616:g:fMsAAOSwNSJa-cS4
^^^seems pretty much plug and play.
I haven't checked whether or not my car has CC, but if it doesn't this has crossed my mind.
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'99 supercharged 4.3 chevy Boxsterado
'98 PP13B powered "RX986"
This hairdresser only cuts mullets
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