Hi Ozzy1,
You are correct about the lugs on the left hand side, I trial fitted the rack Saturday and realised there was something not quite right but was going to wait until I got my ally clamps before doing anything to it.
Had a quick look today after reading your post so it looks like I'm going to have to cut in another slotted hole with the edge of the hole ligning up with the inside of the bracket....
Cheers for that matey..