Is the needlewheel broken or is the impeller assembly bad? It's highly doubtful SWC had a special impeller made. If you can remove the impeller from the pump you might be able to match it up with another. The pump would still work with a standard impeller, just not as well. But they make replacement needle wheels for impellers so if it is one that can be removed you would have the option of just replacing your needlewheel. If the impeller itself is bad you could always buy a laguna 1500 impeller and put your needlewheel on it, or do a mesh mod to a standard impeller. You could just buy a needlewheel pump for a different brand skimmer and use it instead if you can find one with the same connection fitting to the intake of the skimmer body. As long as the pump has it's own venturi it will work.