some of the late model chevy pickups have seats with the shoulder belts built in. just need to fasten them the your floor really good. some say that you shouldn't put them in because the older trucks and cars were not designed for seatbelts. some say it would be a good thing. was going to put some in my panel but now I'm undecided. I don't think the metal on the side walls behind the seats would be strong enough to weld the shoulder bracket to. there was a thread on here awhile back on the subject.