Seat belts

gdizzle.2 or 4 door sedans make the mounting point easier that a hard top. I found some where (goggle) that showed mounting for 3 points in older cars.One is the metal area for a 2 door hardtop next to the quarter glass.Look up aftermarket seat belts/mounting.Maybe ? Also I was told that starting in 68 SOME cars had the mounting point welded in at the headliner even though the third belt was not installed.I was too chicken to mess with the Valiants headliner to find it,afraid that it would fall apart. I do know that my 70 Dart had that third belt factory installed(Though never used back then) and had a clip near the sun visor that held it out of the way when not in use.