If you are interested in Grill Grates, Jon would be the guy to talk to.
Got a reply. No. They do not fabricate SS grates for this model ND they referred me to the Uniflasy CI grates for $35 on Amazon.
As others have said, try contacting RCplanebuyer as he has the ones prior to 2013 and for the newer models as well...
https://www.ebay.com/itm/Weber-Cook...630709?hash=item1ee62b8535:g:EFgAAOxy0rZRFvJU