I can now answer my own question for the benefit of others. No they don't fit. The trouble is the BOS System is sooooo good (well built, fits perfectly and quiet with the DB Eater in) that I'm going to keep it; even though the good people at Fowlers in Bristol offered me "fit or return". Brilliant service - even had a 'phone call to see if I was happy. I'm now going to look at alternatives (doesn't the cost grow!!), although I could remove metal from the H&B bars to make them fit as the clearance problem is around the oxygen sensors, I would not be happy doing this.