If your car has the SPI, use the 400S( s for silicon bypass). If it has the Zetec, use the 2005.
http://www.wixfilters.com/filterlookup/index2.asp?Section=1&Make=28&SubMake=&Model=355&SubModel=-1&Engine=&Year=2001&TempSection=1&TempMake=28&TempModel=355&TempEngine=&TempSubMode l=-1&TempYear=2001
http://www.pureoil.com/ProductFinder.aspx?action=AS
http://www.fram.com/
If you look in the 400S, you can see all the way to the top of the filter. With the 2005 and it's copies, a valve is visable slightly below the opening.
Wix lista the 51315 for the Zetec, 51516 for the SPI
Purolator lists the 25230 for the Zetec, 20195 for the SPI
Fram lists the 3600 for the SPI, 8316 for the Zetec.
Other differences listed below (at least on Wix filter)
Part Number: 51315
UPC Number: 765809513150
All Applications
Style: Spin-On Lube
Service: Lube
Type: Full Flow
Media: Paper
Height: 4.704
Outer Diameter Top: 2.983
Outer Diameter Bottom: Closed
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 16
Anti-Drain Back Valve: Yes
Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.750 2.400 0.130
Part Number: 51516
UPC Number: 765809515161
All Applications
Style: Spin-On Lube
Service: Lube
Type: Full Flow
Media: Paper
Height: 4.828
Outer Diameter Top: 2.921
Outer Diameter Bottom: Closed
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 8-11
Anti-Drain Back Valve: Yes
[ June 20, 2004, 11:56 PM: Message edited by: tenderloin ]