Normally the blades aren't proprietary, they are just some stock blade.Take the old ones and measure the thickness and width. You can find sellers that will cut to the right length if necessary. Here's just one example. globaltooling.net
I am pretty sure you can have those blades sharpened. I read that Woodcraft was a good place to send blades but it may cost almost as much to get them sharpened as new blades. Either way I don't think you will have much of a problem.
If you have not installed blades in a jointer that may be a problem. They can be a bugger. Go to You Tube and there are several good videos on how to do it. You can also ask questions here. That is why this forum is here, but you know that.
If you have the gauge that should have come with the jointer it will give you the approximate amount of knife that should be exposed above the knife head. However, it won't give you the actual final adjustment. You have to adjust the outfeed table for that. If you haven't moved the outfeed table since the old blades came out you can use the hardwood to block to set the height of the blades.
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