I like the pictures and the cuts, we beat to death the springs, anti-drain valves, and bypass. does anyone really know who produces the element "paper", be it cellulose or synthetic? The most important part other than the construction.
Could be literally dozens of not hundreds of media manufacturers. Some of the large companies like Fleetguard/Cummings probably design and make their own.
when I was messing around with Gasgoo, seeing how much it would cost to get a pallet of filers made to my spec ($1.08US per item, minimum 500), the premium paper was made in SK.
I think it would be better to spend time finding out where your aluminum pistons for your car were sourced, and if it doesn't seem to meet your standards, have them changed.