Upgrade to 3 point seat belts

Since I'll be heading to junkyards to hunt down a replacement fuel tank for my 1965 Chevy Sportvan, I decided to finally upgrade the lapbelts to 3 point seatbelts. Are there any preferred models or styles that work best in these vans or is it more like grab what looks good and install?

Can I use the original 2 mounts and just install a third on the wall above the shoulder? I looked through the forum and couldn't find the info I need.

Thanks again,
Mike

I'm going with Jeep Wangler belts in mine,set up right for the way you have to mount them in our vans.

Here's a link to my post on installing Fiero belts in my 2nd gen.

https://vintage-vans.forumotion.com/g-van-general-discussion-f4/fiero-seat-belts-in-a-2nd-gen-t11288.htm#42831

i got a set out of an 83 jag xj6 mounted about the same as
wideload`s fieros