I can't get a hit on that number, the model must be other. But it shouldn't be too hard.
Try to find a reliable sharpening service in your area; someone who does saw blades and knives for the cabinet shops will have a source for tool steel and carbide and can make you a set of knives for your jointer. Just get tool steel. While it won't hold it's edge quite as long as carbide knives, it will take a sharper edge to begin with, and should last just fine if you don't run sand through it.
If you have the original knives, hang onto them as they most likely can be resharpened to like new condition, and steel today ain't necessarily what it used to be.
The critical factor is the height. It's usually between 5/8" and 3/4" tall. You want them to be able to rest all the way down on the adjustable pistons without sticking up more than 10-15 thousands above the cutterhead. That will give you the most resharpenings from a set. You might want to invest in a magnaset to help with setting the knives in place.
Here's a link to the sharpening service I use: http://maps.google.com/maps?rls=com.microsoft:en-us&oe=UTF-8&um=1&ie=UTF-8&q=Precision+sharpening+%2B+Albuquerque,+NM&fb=1&split=1&gl=us&view=text&latlng=15322695688682105671
Finally, I would almost bet some contemporary delta replacement knives would work. If you find a place that will return your funds if they don't, you might be able to order them online. These guys will carry them if you can't find someone nearer you: http://woodworker.com
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