How about a Schroth Racing ASM harness
http://www.schrothracing.com/store/T...e/rallye-cross
Basically a 4 point harness that keeps you from sliding under the lap belt because the shoulder straps stretch at different rates.
I have no experience using them, but it is one of the options I am considering for my car.
Also, check this video out:
http://www.schrothracing.com/docs/SchrothASMII.wmv
Thanks,
Jon