If you go to the menu bar you can drill down and find a link to the spare parts catalog and find the part for your style of Systainer. Please note that the program requires that your computer or device be Java enabled so a portable device might not be the best bet.
Is it just the lid or the pin which is damaged?
If it's the lid which is made of very thin ABS. It's difficult to repair if not impossible
Best to order a new lid (700572).