I am continuing to tear the front end apart and started in on one of the locking hubs. See the pictures here:

IMG20230116154837.jpg
IMG20230116170621.jpg
IMG20230116165428.jpg
IMG20230116165404.jpg

Does anyone have any experience with these? Overall, things are in good shape. However, I'd like to replace the O-ring shown in the third photo, if possible, since it does have some slight damage. However, it doesn't look like a standard O-ring, but more like a square-sided O-ring (if that makes sense?). I'm not sure I could find one like this. Any ideas?

Also, should I just make sure the bearings, pins, etc. are greased up well when I put it back together? Any other recommendations?

Thanks!