I have a front pair of E90 Black leatherette seats.
there is a small "nipple" like thing on the passenger seat, it is circled in red. It is barely noticeable. I think its a piece of rouge foam.
They do not come with seat belts/buckles. My new seats didn't therefore I can't sell them. Just transfer yours over via one screw and a plug, easy.
They are removed from my car and are wrapped in plastic in my garage.
Local only! Thanks.