I saw a few threads where people are modifying a motor guard air filter for oil and using a roll of TP for an element. This looks about right for that size wide.
I recently came into possession of some of these. Some of the boxes look like they were wet at some point, but the paper and steel brackets seem to be the only real victims of that. Gonna put them on eBay, but have no idea how to price them.
Any thoughts?