Engine Cradle Bushings

The front engine cradle bushings on my 96 Chrysler Concorde need replaced. The Haynes Manual which is usually very good shows no schematics or instructions. What is the best way to remove the bolt, nut and old bushing? The top nut can barely be seen through an opening in the frame. What size is the nut? Car Quest does not even sell the bushings. They advised to go to the dealer.