hardy tanks
my 99 kdx220 "gouge", had the left-side top radiator shroud plug pulled out (corn-holed an XR650 on a muddy hillclimb last spring), but no cracking! the plug welded right back in with no huge problem, and has been snug through a number of crashes. and..., it didn't leak through the plug hole, so i was able to complete the ride that day!
i searched for a replacement tank when it happened 'cause i wasn't sure if it was gonna leak or if i'd be able to replace the plug. interesting to note that clarke doesn't make a tank for newer model kdx's. if you're looking for a replacement after-market tank..., i think you're pretty much stuck with IMS.
have fun!