Its less than you'll pay for plugs, etc tbh for the wiring harness from BMW.
I used the GSA one on the 1200 when I lowered the spots on to the lower crashbars with D4's on the top.
Plug and play.
Obviously you'll just need to change the single connector end to go into the PDM as given above and you might only need the GS one if you're fitting them nearer the PDM.