Well look what I found...
https://www.google.com/patents/US8181937
So it turns out that your seal method IS the one LCI used...minus the washer. That being said, not all orings are the same. If I were you I would order the size you are currently using, and the next smaller 1/16" crosss section with the proper inside diameter, but ensure both are 90 durometer hardness. This is important. 70 durometer ones are too flexible to work well in a crush application. They are typically used in dynamic applications. Use the one that fits best.