Thanks Rattosh, I have bought a bunch of blades for all three size mowers, they are at the machine shop getting bored out to fit, I expect them to be finished within a couple weeks, I have not yet come up with a price but should be a considerable savings, these are high end blades as well.
3-YT3600's, 2-YT 6800's, 1-YT6700 for parts.