Thanks!

I'm honestly not sure what to use, but I was thinking something like this (but maybe thinner) could do the job https://www.amazon.com/Compatible-Conditioner-Purifier-Deodorant-16-1x39-3x1/dp/B09MQMMCFJ/ref=sr_1_2_sspa?crid=1315OXCDEX5V6&keywords=dust+filter+foam&qid=1679792917&sprefix=dust+filter+foam%2Caps%2C94&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzVTFKM0hHR1U1SE5WJmVuY3J5cHRlZElkPUEwNjEzNjI5M1FGQ1k3QzM3RlROTCZlbmNyeXB0ZWRBZElkPUEwNzkyMzUxOVRTSFEwTDhNWldSJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

This is specifically what I used, but I already had it for my old Mac Pro, and I ad to cut it into .75 inch tall strips. The key was to line up the steams on he sides where you can't see them. https://www.transintl.com/product/mac-pro-air-filter/