Rear shoulder belts in a 1970 Charger

[CoronetDarter]

The car pictured looks to be a 68 or 69 Charger. The 1970 lower attachment point is in the side panel, not the axle hump as shown.

My 69 Coronet had the attachment points on the hump too. 1970 must've been the change year.
The belts lay down in a nicer pattern from the rocker panel.

 

[Kern Dog]

My thought is that the way the 1969 attachment point is, the belt may feel a bit more it wraps around your mid section rather than resting over it. I'd have to test fit each side by side to know.