Grant, Rob, Dave, thanks for your suggestions to get the remains of the bolts out. I did try the weld method before the chassis went to the blasters, but I wasn't having much luck. I guess I tried 5 or 6 times, but every time the nut sheared of (or the angle iron I welded on at one time)...maybe I didn't get enough heat in the weld, I don't know...but after failing I cleaned up the remaining material and added a centrepoint in preparation for drilling the studs out.
Mike, that's exactly what I was after. I am surprised the bolts are just plain bolts as the parts book didn't mention a size, only a part number and description. Did you really remove one bolt just to answer my question?
Thanks for the imput guys. I hope to have ago at removing the studs this weekend.
Paul...Mike is right; I should have mentioned "Chevrolet".
Alex