Yeah some of the newer ones don't use the spring. As stated, I missed that this was a genII hemmiroid. They also have two lips on those seals from what I can tell. Maybe this will help you.
Unfortunately, that video has no sound and doesn't show the seal installed. I did find one that showed the seal installed, with the lip facing away from the motor. I can see the benefit of putting some RTV on the surface of the front cover where the back of the seal seats on the cover.
