Well, through my stuggles I have determined that at '69 chassis has a slightly different frame rail seam location than in later cars, say '72 or so. My car has the frame rail seam right on the inner edge of the rail where as on a later car the frame rail in inset by about 10mm. This poses a problem when trying to mount the rear sway bar brackets to add a bar to a car that did not come with one because the bracket has a lip on it that is suppose to fit on that 10mm lip. Therefore, I had to notch my framerail seam, mount the bracket, and strenghten it all up. Here are the pictures to explain.
You can see in this picture where I notched the frame rail in the location where the mount is going to be placed.
Here you can see the part of the mount that overlap the framerail and is suppose to but up against the frame rail seam.
I drilled a couple of holes in the mount itself to weld to the body. I also took some solid bar stock cut to about an inch and thread with m8 threads to use an re-enforcements for the mounts. I welded this in and made a piece of steel to fit around the inside of the mount and strenghten the entire thing. I would be very surprised to see this break.
Here is the additional welding to strenghten the mount.
I have since determined that early cars used a different style mount, but I have yet to come across one. I hope that this helps others who are undergoing this modification.
-Britain