I'm still using the super shorty Lotus style filter on my 347. I decided that I did not like the idea of the supply/return lines, with four hose connections as opposed to the reduced filter area. I will probably contact the guys at Barnes, as Jerry suggests, to see if they might have an adapter that would allow use of a full sized filter, but barring that I'll run the best super shorty I can get, which for me is either NAPA Gold or WIX.