Did you look on the side of the old one, usually the part number is there. Just call or take that number to the A/P store and they should be able to cross ref it. If you have the VOM and diesel suppliment check in it.
Found 2 at NAPA site.....
Racetrack/oval style
Item#: FIL6417
Price: $31.89
or
flat rectangle
Item#: FIL6317
Price: $17.79