If they are riveted on, you can cook the oil out of them one at a time by laying them on a hot plate covered by a piece of sheet metal and cooking until about an hour after they stop smoking. The turn over and repeat. There will be an ashy residue that will have to be brushed off.
If you cook bonded lininigs I think the adhesive would release and you would have a real mess.
Linings used to be available new from Welters, Wendell Everett and some of the other MM parts suppliers.