I believe most Westys don’t have the bottom mount holes. I had to use an M8 rivnut to fit my bracket.
I’m entirely confused by this. It attaches to 3 points. A 3 point seat belt is a seat belt that attaches to 3 points. How is the 254 technically a 2 point?
I see. What you mean is the bracket strengthens the shoulder mount by adding another bolt, which is fair. They are both still 3-point harnesses, though, which is the point. Properly installed 2-point harnesses are strong enough to restrain you, but there is a risk of slipping out in high-speed collisions, as well as bashing your head on the steering column, or injuring your spine. The 3-point belt was invented to prevent that. 3-point belts are safer because they restrain both your waist and torso, not because they are attached to more parts of the car. If your 2-point lap belts are at any risk of tearing free in a collision, you’ve got problems a third point won’t fix.
If you're going for one of the cheaper rivnut tools, best to regard it as a one-time tool. In my experience, even doing an M8 will be a struggle if you can't extend the handles to get a bit of leverage. Smaller rivnuts will tend to break the mandril. Aluminium rivnuts better, stainless will be a real struggle if you haven't got the right tool.
You don't. A rivnut tool squashes the nut from the front like a pop rivet. If your near the south west (Dorset) pop in I've got one and some nuts 10 minute job.
I’m not sure where you are getting this idea of a true 3-point seat belt from. If it has a belt that goes across your lap, and a belt that goes over your shoulder, it is a 3-point belt. That is what a 3-point seatbelt is. The three points are left hip, right hip, shoulder. Correctly installed, these seatbelts are all equally safe. Everything else is comfort, convenience, and aesthetics.
I you fitted the 254 in the front as a 3 point belt it would not work as there is no shoulder mount and it would fail to be a 3 point belt
you need one of the 500 or 264 series belts. See this link and scroll down to the 500 series. http://www.securon.co.uk/seatbelts_layouts.htm The 264 has 32cm buckle webbing and should be the correct length to clear your RNR bed cushions.
