The clip is a part of the assembly so there would not have been a separate replacement part available that I'm aware of. If a person fabricates one, it would have to be spring steel. Small pop rivets would work if it's not too large. Driven rivets take some tooling that most folks don't have but they could be driven if a person had the appropriate tooling. The clip on the bottom would get all the rain drooling around down there. A person might look for a used bucket with at least two good ones on top that could be used. There are not as many old car salvage yards around these days as there used to be. Might find something on flea-pay that is usable.
