Retrofit Volvo V60 B&W

[thermal-fixity]

Hey buddy! 
Check this out:
Ref. 15498461
https://a.aliexpress.com/_EI4DIAM

Got it, thanks for the link!

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For the rear door midrange/tweeter wiring, has anyone seen 94/509:8 already populated on the car-side plug? Is that wire actually used/prewired, or is it a blank/dummy wire that needs to be repinned or reused?

       

More details

I’m retrofitting Bowers & Wilkins audio into my Volvo and using the Harman Kardon/B&W wiring diagram as reference.
In the attached wiring diagram, the rear door midrange/tweeter circuit appears to use connector 94/509 pins 7 and 8.
I also attached a photo of my actual car-side plug with the relevant pins outlined. On my plug:

• 94/509:7 appears to be empty
  
• 94/509:8 already has a pin/wire present
  

For anyone who has done the Harman Kardon or B&W retrofit, did you add both pins 7 and 8, or only add the missing pin 7 and leave the existing pin 8 in place?
I’m trying to confirm whether pin 8 is already prewired on some cars, or whether the existing wire is unrelated and needs to be repinned/reused for the retrofit.