body mounts

http://www.detroitspeed.com/1968-1974-X-Body-products/010201-body-mounts.html Has anyone used these before? They claim this will improve vehicle handling response by increasing chassis stiffness. Are they worth $140 and will they make a noticeable difference? If they are I might as well...

Need some help gents! I have a squeaking noise coming from the passenger rear frame. I believe it could be the rear body mount but not sure. So I have 2 questions. 1) where are the rear body mounts located? Do I need to remove the rear seat? 2) any other ideas what the squeak could be? I can...