Something else to consider is that the systems you are considering have the potential to cause you to submarine under the lap belt during a crash. The shoulder harnessses can pull the lap belt up when under tension.
A good retractable 3-point like the Morris Classic Concept is the best bet since it mimics the OE-style pass-through buckle that creates tension in the lap belt during a crash. When going beyond that, to a 5 or 6-point setup, a submarine belt is needed and installed per the manufacturers specifications.
Yeah, I know, it's a pain. I just finished reworking mine since the sub belt was not correct. Think Schroth 6-point mounted in the Formula arrangement. I'll post up info in the Honor Flight thread soon.
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