E-body seat belt install questions

Hi guys, I have a '70 Challenger that just has lap belts so I want to add 3 point retractable belts to the 2 front bucket seats.
It has a headliner in it and no holes in the headliner yet for the upper seat belt bolt.

I'm just looking for some tips on doing this properly. What size and threads are the bolts that go in/near the B-pillar?
And do any of you have pics of that area without the headliner installed so I can get a general feel for where the hole is located.
Do I just slit the...

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Author: ProSport