rrose, you leave the rails bare metal, the rollers will wear off anything you put on them, also, if you put grease on them, they WILL pick up dirt and cause additional wear and or damage to either the rail or rollers, after about 100 yards, the rollers and rails will be all polished and shiny
there were 4 if not 5 different styles of the basic rollers used over the years, for 1955, it would have been the screw covering the grease hole...all was determined by driving the costs down by the factory as to the set up/configuration, any 3/4 inch will work on your machine, including the new ones
so rrose, what are you trying to accomplish and or do? see if the gods can help you out.