When I bought mine there was no model number just Zing. So I bought it to match the sound I bought from Revain. Model 2156A This does not fit the Model 2156A. I was able to grind the mine down to fit. You only grind down the top and bottom of the outer ring about 0.25 inch. It took me an hour and a half using a wood shaping tool and 80 grit sandpaper. When you attach it, look through the hole in the top to make sure all 3 tabs snap into place. If not, keep grinding. First you can check this by removing the screen ring and only installing the main filter. Check the top again and align the tabs. (It took me moderate effort and there was a click when 3 tabs were in place. Overall a lot of pain.
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