Transmission filter question

I know this may sound dumb. It has been a few years since I have changed the trans filter. I am going to do it tomorrow. I got a deep sump pan and was wondering. For the filter spacer, Mine is flat on one side and has an O ring on the other. Will the O ring go between the spacer and filter? I know I could probably figure it out once my pan is off. But on the out side chance I don't. This would give me a head start so I can have it done pretty quick
Thanks again guys
Author: Furios66