You want the kind of cross-bar that is angled back as it gives room to slide the front seats back into the usual position. Be sure to weld them into place at shoulder height as shown below. Mounted too low and your spine could be compressed/broken (a friend/neighbor was killed in a slow-speed offroad accident from that) and too high you could come out of the seat. I wear my 4pt. harnesses on occasion but unless you're doing high-speed racing, I don't see the need for the 5th point crotch strap. Do keep your easily/quickly used factory OE seat belts in place and fully functional, you won't want to wear 4pt. or even the 3" 2-pt. lap belt on a daily basis as they're a PITA.
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