75 no shoulderbelt - child seat belt questions

[swissarmychainsaw]

Sorry if this has been asked 100 times but, it's something important to me, so:

I just picked up a Gentleman Jim which has bucket seats and two lap belts (no shoulder belts).

I want to drive the wheels off this thing, and go camping with my wife and kid, so I bought a bench seat so the three of us can go.



Two questions:
* How to get Three point belts for the two side seats (by the doors)
(is there an upper seat belt attachment on the B-Pillar hidden by the interior trim?)
* How do I get a "shoulder" belt for the middle position?

Found this from https://www.gotbelts.com/specialty-s...ts/83/view/245



The site says it mount so the floor

Mounts to floor at 3 points
Perfect for center position bench seats
Meets and exceeds Federal Motor Vehicle Safety standards 209 and 302

So the shoulder part is long and hangs over the back of the seat?
Anyone actually do this?

Much thanks!
--Nick