"They might try looking for gravely 944 knives, same machine!
It’s been a while since I bought a set, with my new chipper and buying a few sets at a time I think it’s been a couple of years. The only manufacturer I found was ‘knife source’, they seemed to be the only supplier and all the retail places just bought from them. Unfortunately it’s a very uncommon funny shaped knife, and I think they were only made to order (which is why I’d buy 4 sets at a time
Also equally hard to find someone sharpen the right side of the bevel! (Basically a double bevel blade)"
--From a Gravelley owner, not on The TreeHouse