Mark,if it's the correct Magic Air control box, which was an optional upgraded heater,snag the whole thing if he offers it to you.Back when I won that Ebay auction (at 30.00),within minutes I received a pleading offer from the guy whom I sniped in the closing seconds, he "really needed it", offered me 250.00 for it.It remains on my shelf.Now ,the Bay doesn't let you see your competitors,but it was fun back then.I found myself to be bidding against the same guy frequently, he was nearly as obsessive as I am.

It's nearly impossible to find NOS, nice used ones are getting scarce too.