So I have not yet been able to come up with the filter flange parts for my MD Auxilary Diesel. My Diesel filter assembly uses two filter types. The Primary filter uses a cartridge that fits into the machined cast base. The Aux Filter uses the yarn spool and is intendted to have upper and lower retainers with the lower retainer sitting on the cast base that is less machined. It is basically a washer with a shoulder on it. My follow-up question is that it looks like WIX makes an Aux filter(Part# 33147) that is a cartridge type filter with a flat base with a gasket. Has anyone ever used this filter? If so is this filter just intended to sit on the cast base? Or is intended to sit on the retainer like the yarn spool type filter. I will try and attach a picture of the aux filter.