shoulder belts in a 71?

I am not an expert... but I did a quick google search which seems to indicate they came with lap belts only... for example... Seatbeltplus says... "Our Mopar Seat Belts fit the 1971-1974 Plymouth Scamp. Choose between our original style replacement lap belts or choose one of our 3-Point Conversion Kits to replace your old lap belts with 3-point shoulder belts." Leads me to believe they came with lap only...