Airush or LF swivel cloop with sideline safety.
Slingy swivel above trim cleat with 5th as a grab in center hole.
I have 2 myself and have made custom setups for about 8 other guys.
It's called "THE ELPRIMO" tm. LOL

The new axis bar from flexi looks like the best out there off the shelf imo. Shame they dropped the cleat depower though by the look of it.
But, they have sourced (or made)a hollow swivel so the 5th can run all the way thru and down as a safety. I'd like to get my hands on a few of those swivels!!! Can't see myself shelling out the cost of a good kite for a bar!!
Steve - are the Flexi bars still only complete or can we buy part items off you now???