And here is the "Demon" air cleaner. It's sold with the 3 Demon Carbs, to update your 6-pack systems. Now you have me wondering what you have. I know you said it was installed by Mr Norm on the GSS Demons. Do you have a picture of yours? The filter numbers all cross to the same dimensions. I have checked on the Cobra website and they have different sizes. You might call them and give your dimensions and see what they tell you. Keep us posted as to what you come up with.