Don't know if this one I pulled out of my r32gtst is oem but it's definitely a paper filter inside.
...the brown stuff is rust, after my fuel pump died I discovered the large o-ring seal at the top of the sender unit must have been installed incorrectly, as it had a kink and squished flat spot, it appears to have been like that from new.
Yes the rust was from the fuel tank and you should have seen the pile I removed from the tank, no wonder the pump failed.