Thanks guys. My main concern is using a booster seat which requires a shoulder belt. As of right now, I think I'm going to look at the possibility of installing some original looking rear shoulder belts.
Another option is to find a high back type of booster seat with a built in harness that uses a top tether like Tim showed.
I remember all sorts of unsafe travels when I was a kid. My grandmother's 64 Pontiac had no belts at all. Dad's 67 VW had the rear belts tucked under the seat, rusted floors and a missing passenger seat for some reason. And, of course, riding to Hershey Park in the back of and old Dodge Tradesman with no seats or anything in the back. It was fun rolling across the floor into some pillows when dad had to slam on the brakes on the turnpike.
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