Dont you just hate it when you get more than 1 option on what it could be, i had the same issue when i replaced some brake pads, what i did was to phone a local parts dealer and checked if they had the pads in stock, i then removed the pads popped along to the parts dealer and measured them up there so i know i had the right size for my car, same idea could be used to make sure you get the right size oil fliter