I can't find the cross reference you seek, and am wondering if Penn State no longer makes or supports this planer. (
Here's one archived review from 1996.) However, any reputable sharpening shop should be able to provide you with tool steel or carbide planer knives, or resharpen your existing knives. If the knives have specialized holes for mounting, etc, there may be a surcharge for drilling the steel to fit your planer, but I suspect with the economy the way it is most sharpening shops will be happy to undertake the task. If they balk, find someone who's qualified before you spend the money on new knives. What is important is the the thickness of the tool steel is comparable with your knives and the width is within the specs of adjustment for your planer. Usually normal tool steel will get sharper. whereas carbide is tougher to wear out.
If you can't find anyone local, I can wholeheartedly recommend Precision Sharpening in Albuquerque, N.M. They have quality grinders and do professional work.
If your knives are of the disposable type and your can't locate a substitute, try contacting Penn State Industries
here.I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!