Product review (5 stars): Expensive, but the only game in town.  And it worked.
Wow, this was expensive.  It should have been six or eight bucks, max.  The tube of stuff is probably expensive, sure, but I only needed a few drops per rubber doohickey - a tube the size of a bitty superglue tube would have been plenty.  Rubber feet?  pennies apiece.  So, this was an extraordinarily expensive fix, here, given what's included!
However, once I got the package, the instructions were clear. (Crappy photocopied instructions, pictures were black boxes, but at least the steps were well-written, so pictures weren't needed.)  The stuff did what it needed to do - my stove grates are level and usable again, with minimal assembly or mess.
And Amazon, as usual, rocks.  Best price (out of a dreadful selection of prices, to be sure), and shipping was fast.