It is very substantial / heavy, and has what seems a complex locking mechanism so I'm not surprised at the price.

Found this on bay https://www.ebay.co.uk/itm/182157721533 or found full witter detachable bar for 190 so I think 217 is a bit expensive also as someone already posted contact last owner they might still have it or if it was advertised with tow bar go back to where you bought it they owe you the rest of the bar

Thanks biddz - I don't think that one will fit an X-Trail. I have seen one on ebay that will though, for £188 - although I haven't paid for it, I have ordered it now, so I'd best stick with the Witter fitter - at least I know it'll definitely fit.