I did a search of the seatbelt installation topics and got some info but not a lot, surprisingly. I think most folks go with lap belts only - easier, cheaper, and better than nothing.
2 answers - 1. I'm using the retractable belts because I want shoulder belts and these are far easier to use, store and more comfortable than non-retract systems. 2. The body mount bolt location just because it's in the perfect spot. I can go just in front of it, behind the seat tracks, but the body bolt is the right geometry (directly in line with the pillar, and therefore the upper belt pivot point).
http://wescoperformance.stores.yahoo.net/welr.html I've read a passing remark on some other forum about "never mount to the frame!" but with no supporting info to say why. I can guess that if the body and frame separate then the occupant is going to get squished by the belt. So, the body mount bolt in this spot doesn't go into the frame rail itself, but one of the outriggers. Still might apply though? I can't find anything about this frame situation in any installation instructions I've read on many, many sites and product pages.
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