Tri-Power air cleaner/air filter element

Alright guys I need a little help here. Most of you know I got my Tri-Power air filter base and top back last week from Leanna of Phoenix Specialty Coatings.

Now I need/want to find the correct air filter element that sandwiches between the top and base. I asked another member what he did for a element and he found one somewhat similar but had to modify by cutting and trimming one down to make it fit. That's not really the route I want to go down just yet,only as a last resort.

All I need is the brand names and part numbers. Maybe this style element isn't even being made for this style tri-power anymore? I don't know? Any leads and help will be appreciated.

John