Technically speaking, that seat belt anchor needs to be where the lower frame rail, and the upright meet, just in front of the rear axle, that gets it back far anough, and low enough in the chassis, to plant your butt when you tighten the belts, the way I see it in both chassis, it offers little if any help, in an end over crash of anykind, you need the angle and the length on the belts, to allow the lap belt to do it's job, personally, I wouldn't drive a car set up like that, nor would I pass it thru inspection, I think if you do ever, and it will happen, not if, but when, have a crash where you are subjected to being upside down, and or landing upside down, the results may not be to your liking. JMHO Bob