Sure, you could just replace one or two of your filter caps, but why not just upgrade all three of them to both ensure they'll never crack like the stock plastic ones are known to do, plus add some cool billet to your truck? These caps are an exact, direct replacement of the stock ones that utilize OEM and Racor filters for an exact fit and allow you to use the same o-ring that's included with OEM replacement filter packs. All caps are tapped with 1/8" NPT for use with an oil pressure gauge , oil temperature sending unit, or fuel pressure gauge.