Integrated Shoulder Belts, front and back?

Thee are the seats in a durogo limited I picked up for a 5.9 FI swap and the front seats will fit, I am thinking the rear seats can be made to work and have small head rests and belts. there is also an even smaller Jump seat in back. I will try to get a pic of rear seats tomorrow when J returns to work, he wont stop driving it long enough to pull engine.

I have a 69 HT with no head rest bench and need neck support for back injury plus I have a 6 year old in back seat so rear rests and shoulder belts are mandatory.

Sorry for sideways pic, cant seem to get em to post upright but you can see rear a bit and get the basic idea. Will post if its close to correct width.