I'm not quite sure I recognize this. Is this one unit with four rollers, or is it a twin wheel broken off a housing? Do you have a good sample that isn't broken?
Twin wheel broken off of housing.
I can't quite figure out what the part looks like when it was together. Could you take a picture of one of the roller housings that's not broken and submit it to us? Or, you could possible lay out the broken parts and take a picture or two of that.
Hopefully we can ID it and give you some ideas on what to use.