I'd buy a full set like this. After the 3.4 is installed and verified good, I'd sell the 1997 set that was originally in the car to recoup my cost (because I'm cheap like that).
Autobahn Parts - Electrical, Porsche 911 996 OEM 1999 Carrera Alarm Control Module + ECU + Tumbler w/ Key, 996.618.601.04, 996.347.017.07, 996.618.260.05
or
 https://www.ebay.com/itm/334397963288? *Their eBay feedback is a bit low for my comfort, but reading the details they seem legit.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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