Pull-a-part is your best friend. You can get the clips and injectors from an OBD1 SOHC and eliminate the resistor box wiring. You will only need one ECU plug because you will only need probably 2 pins out of it. You don't need any harness. You will need the harness side of the distributor plug if you want your A6 distributor to be plug and play. (this is the hardest plug to find) The throttle position sensor wires you will have to extend and swap the two outer wires, but you can use regular auto parts store wire for that.