Take a good long hard look at the photos. The ends (which can be bought separately, see link, are secured with pop rivets) It should be possible to drill them out and remove one end and associated fittings, shorten to the desired length and drill fresh holes and re-rivet. All you need is a power drill, pop riveter, probably a vice on a bench and suitable handyperson.
https://www.ebay.co.uk/itm/294781794512?epid=12027277399&hash=item44a25d38d0:g:YkQAAOSwLHFh9mcj