If I've understood your question right - no, not mounted to the stock mounting at all. It's two bars mounted to the floor running in parallel to the crossmember. Bolted or welded to those it's a u-shaped bracket underneath the runners. I might be able to find a picture, will try to post it tomorrow.
Pictures would be great.
But I think I got you. Thanks =)
This one's the best I've found. I haven't used a full bar underneath the runners by then, later it got replaced by a one piece bar.
Thanks exactly what I was looking for.