How to replace rear transmission mount on 2002 Buick LeSabre

I tried to remove the rear transmission mount but was unable to access the two top nuts on the mount so I tried to remove the bracket that it mounts to from the side of the transmission to remove the two parts as a unit but was unable to get them out . Is there a way to get to the top two nuts ? Or is there another way around this ?

Asked by for the 2002 Buick LeSabre