Yeah I've emailed Team Corally but they say they not selling any bumpers for it and need to check out the after market I've find 1 or 2 on the Internet but they are from Germany or America and are working out very expensive , ebay sell some but not for the Kronos apparently
As far as I know the only companies that make aftermarket bumpers are T-Bone Racing out of the US and POS Racing in Germany and I am assuming those are the 2 that you found.