Looking at the service manual, it references replacing just the blade part of the wiper. No info on complete replacements.
I seriously doubt they are proprietary, but they certainly look different than what I've had on my Mitsubishis.
Here is the refill:
http://www.courtesyparts.com/26373p-...714_8880_9176&
The parent page to that has the complete blades. I think maybe the blades are the same size for each size? Looks like the base part number is the same for the 2 full blade assemblies.