I had J-hook discs previously and they were fitted with the tail of the 'J' pointing backwards. My thought was that this would be best to eject dust, water and crud. However, I have seen TFSI-Mike's on another thread as well as others (VRS_Carl) who had the discs swapped one side to the other such that the tail of the 'J' pointed forwards.
Here is a picture from my old car - you can just about see the orientation...
Here is a pic from TFSI-Mike's....
So which is right?