Did my car come with 3 point seat belts?

My belts are in sad shape, only have lap belts, and looking into aftermarket seat belts. Looks like my front have the shoulder bolt up high where the windows join but I can't see anywhere there was ever a pivot for a shoulder belt in the back seat. Did it come with them, were they an option, or is just lap belts standard equipment in the rear? Thanks for any and all input/advice!