I've used Napa filters before.

The 'O' ring will fit, but it's difficult to get on properly because it's slightly too big. You just need to be careful, which means holding it in place with your fingers until the filter housing is almost seated.

It usually took me 12-15 tries to get it on right; it was pretty frustrating.

I use the Made in Turkey Frams now.

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Ralph

1985 300D Turbo, CA model
248,650 miles and counting...