They were as nicely packaged as the panniers. No instructions but it's a straightforward install. I did go to hardware store to buy longer metric bolts so the passenger grab handles can still be used. ( I forgot the the size and pitch at the moment) Keep in mind that the handles need to be offset, (at least that's what I found I had to do in order for the right side case to open and clear the handle) I will post better pictures if anyone is interested.
As I recall, I placed the grab handles between the mount and the frame on the right, but the mount between the handle and the frame on the left, exactly as you say so the lid would open. It may be that I had a spacer from a prior rack that I used on the right forward mount? Anyway, it all went together pretty well.