actually, it was there for a 3 point harness... There weren't many trucks that had them from the factory, but they're out there.
A good place to buy new seatbelts in whatever color you want in a super nice set up is Juliano's Rod parts. They're famous among street-rodders for their seatbelt setups. Right now, I'm running a 3-point set from a 86 s-10, but they're getting ragged, so we're going to get the juliano's belts.
You can check the belts out at
www.julianos.com/catalog.html
Also, the Juliano's belts are made for either bench seats or buckets...
Riley