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It sounds like have a generic reducer/flattener which should work with your 80mm. It's a fairly common thing as well. I had an old reducer/flattener for my 80ED which was made by Orion and covered a wide range of focal lengths and f/ratios.
You'd just have to make sure you are able to connect it to your scope. My one wasn't threaded; it had to be held in place by nylon-tipped locking screws (which I don't like)
When they make dedicated flatteners for your scope, they are always more expensive. My 0.77x and 1x reducer/flatteners for the Esprit were pricier than the Orion one.
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