Good day, I need to replace the paper cartridge on my processor. It is a 4x2", cylinder pleated paper filter with rubber o-rings at either end. THe ID is ~1.25. The original model is a Puro Flow II (S/N is/was 1281011-041 or 8350059). I figured this would be cake to find so I didn't start looking until I was (past) needing one. I've spent the last four days looking with no results. Any help would be appreciated. Thank you in advance.