Thanks for the replies everyone. I guess seat belts makes the most sense. I ended up mounting my seat belts to the bolts that mount the cage to the tub. It looked like later versions moved the seat belts lower that is where mine ended up, mines a 71' for reference.
Hi all, going though a new (to me) 40 and I cannot figure out what these tabs are for.
FYI this is just a picture I found off the internet, but its the same cage I have with the same tabs.