Okay, I am about to do my first oil change on the 85 300 SD. I had ordered the 2 O rings that go on the shaft that goes through the oil filter cartridge.
Now I can only find one of them. I may not have to replace both but does anyone have a P/N I can get from say NAPA if I find the current O rings destroyed. Or If for some reason I can not what would be the outcome of using just one ( also which one is most important) for a few days.
Thanks

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )