Seat belts question

[boxboy]

When mounting the lap belt do you go straight back from the edge of the seat or out an inch or 2 or under the seat an inch or 2? Or does it really matter?

I have just a standard seat not a bucket with cut outs.

Also I have a single point mounted shoulder harness which will run up through the metal bars on my head rest, how far below the top on the seat should this mount be?

 

[boxboy]

Here is some good info I found on a stockcar site

http://www.stockcarracing.com/howto/134_0406_seat_mounting/index2.html

Belt Attachment
A&A has a new part, a "U" shaped piece used for belt attachments. You should always mount belts between two tabs, putting the belt attachment bolt in double shear. The A&A bracket lets us weld one tab in place and still have the attachment bolt in double shear. We used these for the lap belt holders.
For the shoulder belts, we did it two ways. If you have room, use the double shear bracket. If the seat is too close to the cage bar to allow the adjuster or mounting hardware to clear the seat, then use a single tab pointing down as shown in the photos. Be careful to mount all the belt hardware in the correct location.
We selected a six-point harness from Leaf Race wear. The lap belts should angle up at about a 45 degree angle from their attachment point. They should follow a path across the pelvic area of the driver. The mount should be located so that the belt does not pull against the edge of the hole where it goes through the seat. The double shear bracket here is nice to have because the belt hardware can freely pivot.
At no time should the belt adjusting hardware contact the metal seat. It must be on either inside, or preferably outside, the seat. Such contact can cause improper adjustments as well as the infamous "dumping" where a belt is stacked against one side of the hardware. Dumping could cause shearing against a hardware edge.
The shoulder belts must not depend on the seat hole for their vertical location. There should be a seat mount bar or chassis bar behind the seat that locates the height of the belts coming off the driver's shoulders. The bar should allow belt angles of about 10 degrees down behind the seat.</SPAN>
Most of us are familiar with the five-point harness; it has a single, front anti-submarine strap attaching below the seat. This isn't bad. I've used one for years, and my voice is still in the same range it has been in since I survived puberty. The purpose of the strap is not to keep you from sliding forward, but to keep the lap belt from riding up and then letting you slide forward.
The six-point harness has a double strap, if this makes you feel better. The best part--it's easier to mount than a five-point setup. The double straps attach to the lap belt mounts. Then they wrap under the seat and go up through the front hole in the seat.
A bottom view of the seat shows the two anti-submarine straps routed under the seat and attached on each side at the lap belt location. The tab in the center is for attaching a five-point harness. This tab should point down or back, not forward or up.

 

[Jeepasaurusrex]

 

[boxboy]

Thanks Jeepasaurusrex for the drawing it helped!