My wheels came from AJ and I asked for exactly the same offset on the wheel on the inside as per standard with the extra width to the out side oof the wheel.
AJ gets standard wheel centres cut out..........ie standard wheels which you supply are chopped up.
The standard centres are then welded into a single piece off the shelf rim which has no chance for leaks though the rim as it is one piece.
I have 6 wheels now done this way without trouble.
Having the extra width to the out side of the rim used with a larger diameter tyre keeps the kingping \ scrub radius very close to standard.
The set up on mine has been without trouble and fits well within the ex Aussie army mud flaps ect.

