You really need proper tools to extract and replace bushings. Some you can make do with home made or other methods but those in converter are going to require something to go behind then expand and grab and pull.
On the bushings in general, you need to be careful you don't scratch, distort or get them started crooked & mess up the seat area they fit into or you've just wasted your money. They are a bit fragile and don't have a lot of tolerance before they leak as bad as the old. Also have a good look at the shaft areas they fit around for any signs of wear. A new busing won't help a worn shaft for very long.
Have a look at service counselor Vol 28 #12 for the tools and proper method of using them
packardinfo.com/xoops/html/downloads/SC/SC-VOL28NO12.pdf The service manual also has some instructions on removal/replacement.
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