I bought 5 of the smaller Fill plugs like the Haldex plug as I was under the impression they were the same for the Diff Fill and Drain. Every pic I can see of the B6 Diffs show the smaller VAG-N90281802 10mm thread.
![Image](https://live.staticflickr.com/65535/51135274175_5bf31fe29b_w.jpg)
Can anyone tell me part numbers. Cheers