If you have the OEM blade number you can do a search at Jacks small engines or the gatorblade website and see if you can find them.. On the gatorblade website when you are placing the order they ask for the specific model information, so I would assume they would make sure you got the right blade..
I have been looking for a gatorblade for our toro push mower, but think I would have to use the 'generic' models since I cant find one specifically anywhere.
good luck
brian