PB didn't seem to do anything last week when we tried it. Guys @ the local dodge dealer seem to think if the bolts seized up the bushing is screwed. We could only get a 1/4 turn on the bolt, the bushing would twist than both would twist back when let go.
I did this too just a few weeks ago, we ended up grinding a flat spot on the steel so we could get some vice grips on it, then used penetrating oil and a torch to free the bolt. Wrecked 3 pairs of vice grips! Glad to see you got them out!