OK I need a filter for my truck. LTvette gave me a great tip on ST 3950's still being on clearance at some wal-Marts, but I haven't found any yet. As long as I could find the PF 1177's, I used nothing else. After they disappeared, I ignorantly used PH 3950's. Eventually I compared them to the ST and never went back. Now they are gone. Been using L 10193's, but I was disappointed to find little more media than a Fram has in the last one. I don't like their dome end bypass either. The ST 3953A's are much smaller and have a clicker bypass inthe dome end. Anybody have an oversize number for them? Champ suggests a PH 2856, The old ST 3590's had a Motorcraft number on the box, but I can't find it now. It is a good sized filter with the M 20 thread and a bypass.