I don't want to break your bubble, but there are very few who are restoring oil dispensers compared to those who are restoring gas pumps, collecting globes, collecting signs, etc.
I once purchased all the contents of a bulk plant, in a field there were at least 60 oil dispensers thrown in a pile, I did not take any of the home.
I do agree that they make a nice addition to a collection, but they don't have many people who are advertising/asking for a particular oil dispensers like there are people who are looking for a Wayne 60.
I know what I have said is not encouraging, but other than one person who makes the wooden ends of the crank handle, no one make parts for a oil dispenser.
Just to make a statement, many guys post requests for information/parts, etc., for a particular gas pump, but they always state the which gas pump they need the info, etc. for. When it come to oil dispensers, keep in mind, I can name at least 30+ companies that made oil dispensers, and they were all different. This is for everyone, if you are going to ask for information/parts for a particular oil dispenser, please let us know the name of the company that made the dispenser.