how does the part-throttle channel heater from the pierburg fit onto the weber?

Hi there people, after ages searching for one I finally found a part-throttle channel heater that you find on a 2e2 carb so I can fit it on to my weber, how does it fit to the weber and where do the wires come from for it? I don't seem to have any spare wires under my bonnet! Any info much appreciated

i recall doing this a long time ago. i think i took 12v from the manifold heater feed. The actual heater element bolts on easy, get hold of the DMTL parts sheet (pdf) to identify the correct position

see my sig, weber.pdf