So, on my new to me 03 Slk32 each seat has a strap that one would think is to be used as handle to tilt seat forward.

On my vehicle that doesn't appear to be the case as seat not tilting and i see no buttons or levers for this. The bottom snap of each side strap is blown out of leather.

Are these snaps that allow for removal of strap or are snaps more of a permanent nature allowing straps to be securely mounted to seat?

Are seat belts to go inside of this loop? If not, what are they for?