I have been using the gator blades for 7 years now, they are a very good blade and stay sharp for a very long time. I also had a problem finding blades to fit my Kubota, I had to make a 1-1/8" OD X 7/8" ID bushing for each of the three blades. Here is a link to Oregon they make the Gator blades.
http://www.oregonchain.com/pro/products/oep/G6.htm