Hi K96….I can PM you his details if you need just drop me a message.
Once the roof rails are inserted into the roof through the openings you've drilled you'll need some bolts to secure them from the underside in the roof. I didn't supply him with any nuts or spacers so just take it he had some spares laying around to use.
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Sorry to pick this up a year later - but just about to buy an 2017 A3 Black Edition and it really needs the roof rails. Any chance you could send over details of who fitted them for you please?
Many thanks… And Happy Easter