The cross-member bushes are nearly 4" diameter and obviously I don't have any sockets that size but this piece of extractor fan ventilation pipe worked just as well.

http://www.flickr.com/photos/peters-bmwmarlin/8291012882/http://www.flickr.com/photos/peters-bmwmarlin/8291012882/ by http://www.flickr.com/people/peters-bmwmarlin/, on Flickr

The other side of the bush was a nut and an old crush tube. Just wind up the nuts and the bush just popped out without any effort.

http://www.flickr.com/photos/peters-bmwmarlin/8289953385/http://www.flickr.com/photos/peters-bmwmarlin/8289953385/ by http://www.flickr.com/people/peters-bmwmarlin/, on Flickr

http://www.flickr.com/photos/peters-bmwmarlin/8291014138/http://www.flickr.com/photos/peters-bmwmarlin/8291014138/ by http://www.flickr.com/people/peters-bmwmarlin/, on Flickr

On the left is the original Ford rubber bush. On the right is the new poly bush. Apparently, the top ring is optional and I don't think it's needed on my car. These bushes are about 4" diameter!