Thanks. I figured that's what I did. When I went to put it in the lower grove, I find it had been stretched. I did the oil service in the fall and did a new filter oil etc. Up to now I didn't notice the leak and it collected in the pan. I hoped I could just buy an o ring. I'll just order another filter. When it comes in, I'll go to Rubberline, get a matching o ring from them and then replace it. Thanks.