Finally the weather was good enough for me to fit my sharkfin combo
FM/AM works perfectly and I also ran the GPS cable so I don't have to use the 3rd party one above the RNS510 although I don't see any more satellites
Whoever built my car managed to wrap the FM cable around the airbag cylinders making the removal of the old cable harder than it should have been
My version from ebay de also came fitted with the telephone and aux heater remote control, which I left unconnected