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PA28: Hmmm. It's such a long time ago that it was published that there is probably no one at RCM who will remember. But, why don't you try giving them an Email and just see. It is possible that the info is in their archives somewhere.
Have you checked their plans section to see if there is a picture there of the model you are looking for? Also, scan the ads in the issue and see if you can find it. Otherwise I guess that you will just have to hang in there and see if anyone can help. Regards.