It's the #7 seat. The three squared rings are accessible from where the #30 bolt installs, distributed evenly along the seat. Perhaps they're just handles.

Thanks again for posting on this,
Jake

 

Not sure what they are, maybe anchor points for the seat belts? You'll get a better look when the seat-base is removed.

 

Sorry to thread-dredge, but since I'm the author of this one, I thought I'd say that I fixed it, thanks to the help of this forum and despite my initial timidity. Last year, I took apart the seat but could not find where it was bent or how to reduce its unevenness. So I decided to live with it until today, when I saw the upholstery had begun to wrinkle due to the seat's imbalance.

I removed the rear seat once more and this time, I bent it almost into a half-circle. It took some maneuvering to re-install, but it's in and straight. I wish I knew how it became a problem to being with, but if anybody searches out this issue, just be brave and bend until the seat overcompensates for the mis-formation and it'll work.

Thanks again for the help here, and sorry for the late, late follow-up.

Jake

 

A late follow up is better than no follow up..it's good that you came back and told us what is now okay.
Thank You Member...

WheelBrokerAng