Thank you very much Mnot for your response. You are correct, it is the big o-ring in the oil filter housing/oil cooler. I got desperate yesterday when I did not see any responses and saw on the forum someone had used a website called Amayama Genuine Japanese parts. I got on their website registered and entered part # 8-97101-953-1 for o-ring and they had the part. It takes about 24 hours for them to verify they have the part and then they will notify you of the exact cost of shipping. The parts were $ 2.78 each, which I ordered two of them. Shipping is expensive but worth it if you need the part. Total for 2 o-rings and shipping was $ 33.06. Hope this helps someone else looking for this part. Again, thank you! Mnot for your response, I appreciate it.