If you go to the wixfilters.com web site they have most of the info there.
Then take the numbers to napa or carquest parts house. The 1qt
filter is #51121. The o-ring #15086.
The 2 qt filter is #51133 The o-ring #15119 The o-ring at the bottom
is #15333 Now I have never replace that and the spring would most
like be a big problem with that. I look at that as if it is not broke, don't
fix it. The o-ring at top I usually spread a thin layer of gasket sealer to
help seal. I hope this helps and I have the right numbers.
Keep them GMC's running.......
