Tried the search? There's a DIY (with Pix) and lots of discussions on sizes and everything you can imagine about Magnefine. Try the search.Thinking of putting a Magnafine into my sister's 2000 and my wife's 03 Ody's. What diameter do I need 3/8" or 1/2" fittings? Also, How do I know which line is the return line? Has anybody used this filter?