How do you change rear brakes on 2000 buick lesabre?

The ram on the rear calliper is threaded and need to be screwed back in order to get the brake pads in. I also had problems with the Munroe brake pads that I bought being to thick. I took them aback to where i bought them and the parts manager told me that this was a known problem. He gave me a set of different pads and I had no problems installing them.