I recently fitted a rear box, on my TD, purchased on line from Eternal which are well spoken of here. Unfortunately either the front or rear mounting bars appear to have been welded in the incorrect position, such that when fitted, with a new mounting kit, the bars rattle against the chassis or car mounted bars. I have had it off twice to bend the bars to improve the mounting. Not completely satisfactorily as it still rattles occasionally, so I will be replacing it again with another make.
To be fair to Eternal, they have agreed to refund the purchase price ( only about £30), but I would have preferred a replacement so that I could send this back for inspection.