I know this thread is old
I just pushed out the rubber bushes.
First I used a large socket 1&3/16th sidchrome
and a 21mm socket.
Second find a engineers vice eg Dawn brand that is big enough to open the jaws to take the two sockets and pitman bar bush.
Put the bigger socket on the back of the bush you want out as it will sit over the external diameter of the bush then use the 21mm on the other side as the push pin as it's just under the internal size of the out side metal collar.
Once all this is lined up just wind the vice in and it pushes it out the back most of the way. When it can go any further take the arm out of the vice and hit the small socket through as it will fall through.
The hard bit was lining it up in the vice by myself and "just winding it in" lol I had to use a 400mm piece of tubing to wind the vice in in and I gave the panhard gentle taps on the ouside NOT HARD HITS and sprayed some wd40. It took me a total of 20 minute to cleanly remove the bushes.
Thanks every one for there comments as I found all the advise useful as im a cabinet maker not a mechanic.