Hey, Fred, sorry to hear about your blade. I assume you tried Don Niesser. Did you also try Preferred Airparts (800-433-0814,
www.preferredairparts.com)? They claim to have a large stock of blades. Also, call all prop shops advertising in Trade-a-Plane and see on the Trade-a-Plane classifieds (at the end of the Cessna classifieds under "Cessna Miscellaneous") if anyone is parting-out a Skymaster.
Regards,
Ernie