All I know is that it is not legal to run blades other than OO-74 Series blades on the Cruisair, presumably because they would cause ground clearance problems in some attitudes.
I have the same problem with blades. I sent my good one to Kent to match more than 4 years ago and am still waiting for a replacement. He estimates charging $1200/blade, though, so I wonder how many takers he'll have.