The filter had the big rubber seal on it. But the center bolt is leaking.

I'm sure I can find one at NAPA or other, but then I have to pull the filter and measure the oring. I was hoping I could buy one before I pull it again.

Anyone know the size?

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77 300D- new to me, lots of "issues" to deal with. But a nice unit.
Diesel man- 84 Toyota Diesel cruiser