I may have given the wrong impression... I wasn't suggesting that he mix the Green Teeth with the Rayco ones... merely pointing out that he could put a whole new set of pockets and teeth on it for about $350.00 if he went with the Green Teeth (they make a set for his grinder). I'm having trouble figuring out exactly what the question is, too... he seems to be implying that he's considering a new stump grinder because a couple of teeth need replaced. $350 might seem like a lot of money for the whole set, but buying a bigger stump grinder means paying even more for a set, when that one's teeth wear out, chip or break. It's a machine to grind tree stumps out of the ground... by its very nature, that process asks an awful lot of the blade. Even the biggest grinders have to have the teeth sharpened or replaced eventually... and those ones are really expensive.