5 point harness mounting location

as i posted that three point will probably just rip out in a crash, go a two point and youll be fine, or put a cage in and do it right

Is that a common thing?

(Sorry for all the questions, I have not dealt with seat belts before)

It looks like the car came with a 3 point from the factory. I removed them because the retracting feature would jam every now and then on both of them.

It seems like the top mounting location was welded to the body and the bolts look big. :read:

I came across these:
http://www.morrisclassicconcepts.com/duster70-73.html