So I just got a 2004 1500 with the 5.7 Hemi in it. When I went to change the oil filter, they had a Fram PH3600 installed instead of the much bigger Fram FP16 that it calls for. With the old filter off, it doesn't even look like the FP16 would fit without having part of the gasket hanging off. Any ideas why someone would have put on that PH3600? What am I missing here.......