Hi.. I'm replacing my rear bumper on my 69 GTO and noticed the rear cross member is pretty well rusted and the rear body mounts are cracked and fairly well shot. I'm thinking I should replace the cross member and body mounts while I'm at it but don't want to open a huge can of worms. It doesn't look like I can get at the top of the body mount bolts without cutting into the trunk pan. Anyone have experience replacing the rear cross member they can share?