Seat belts?

["Paul" <9laser3@bright.net>]

  I know this has been discussed several times, ... but I'm old and
forgetful!  So, what kind of seat belts are available that work in a late
model roadster with stock seats?  I'm looking for safety so used belts from
the JY are out.  I would prefer a 3 point belt over a 4 or 5 point harness.
Not for racing, just planning on doing a lot more long distance trips this
summer.

TIA,
Paul Kort
Ohio