I was just curious I have a neck issue and cannot wear a shoulder belt I also have a medical exclusion to wearing a seat belt but was thinking a lap belt would be better than nothingPer my experice from my old '72 Monte, GM changed they type/style of the shoulder belt in Jan '72. Went from having basicly two sets of belts for waist & shoulder to one set with three belts that the waist male buckle has a key hole for the detachable shoulder belt with everyone's favorite buzzer/warning light set up.