mate, yes there is such a thing, but a real chrome grill will costs you megabucks!
see this thread
[url="http://www.clublexus.com/forums/showthread.php?t=139159&highlight=chrome+grill"]http://www.clublexus.com/forums/showthread...ht=chrome+grill[/url]
or you've got fake chrome grill on ebay
[url="http://cgi.ebay.co.uk/LEXUS-GS-CHROME-GRILL-KIT-GS300-GS400-GS430-GRILLE_W0QQitemZ4643021456QQcategoryZ100915QQrdZ1QQcmdZViewItem"]http://cgi.ebay.co.uk/LEXUS-GS-CHROME-GRIL...1QQcmdZViewItem[/url]
personally, I'd stay away from the fake chrome grill. I doubt it would look as good as real chrome.
you should be able to get touch up paint from lexus, if you have lots of stonechips, you need a respray