Back in the good old days when big brother would let you import a grey market car into the USA, most needed a kat and sensor installed. I remember shops using the sensor from a 4 cylinder Ford T'bird Turbo which came in an Autolite box. Inside was a Bosch 0/2 sensor. The part numbers to a similar Porsche sensor was one digit different as 0 280 003 002 versus 0 280 003 003. The only difference was the connector and lead length...and lots of $$$
Some parts houses have one wire and heated three wire generic universal 0/2 sensors for sale. So far all the threads are the same...don't tell the manufacturer or they'll put some strange ones in so you HAVE to go to the dealer for it!
Good luck to the sensor changers..!