Bad luck mate, don't worry though as ebay has loads on it. Just get them to email you a search for "50mm clip on" and some'll turn up soon enough. I bought 3-4 alloy pairs over the years, all for less than £50, even a pair of Harris GPs.
If you dont fancy that why not bend the bar back and then slip a piece of solid rod up the middle to add some strength? Not sure what the ID of your bar is but sure someone can help.
Ali