Here's how I did a frame-hung rear bar with an Addco in my Duster:
http://stuff.is-a-geek.net/PhotoAlbum/Cars/Pics/duster_26.jpg
I ended up moving the frame mounts a coulpe inches higher and clearancing the floor a little before it was finally finiished, but if you have the fab skills, no biggie.
Like VK says - handles more like Bimmer now...