They're out there, most don't fit very well or have a break in them somewhere. They're also available as a reproduction, and those generally don't fit very well either. Just about all of them require some potmetal work to get them to line up with fenders.
If you are looking for the actual pot metal bucket that bolts to the fender and holds all the goods, I have OEM units that are not broken for $100 each. If it's the bucket extension, or the door, I have them for $15 each plus shipping. Thanks, Jack