Hairbag-

Here are some options. Rather than re-invent the wheel, I searched and pulled these up. Your third point above the shoulder will have to be welded to the pillar. The set-up depends on the source for your belts, but most are very similar. These threads are for AD cabs, but the principles apply to your Apache.

See:
3 pt Seatbelt Thread (with some good pics!)
3 pt Installation Thread (with some more links)

Hope this helps!