Standard motor products make several versions. Closest I found is this, if you don't care about appearances or there is one where you change the coil side terminal, but its even expensive. Ebay has some for $30+

http://www.rockauto.com/en/parts/standard+motor+products,RC23,radio+capacitor,21698

http://www.rockauto.com/en/parts/standard+motor+products,RC26,radio+capacitor,21698

http://www.rockauto.com/en/parts/standard+motor+products,RC15,radio+capacitor,21698

http://www.rockauto.com/en/parts/standard+motor+products,JC59,radio+capacitor,21698

http://www.rockauto.com/en/parts/standard+motor+products,RC28,radio+capacitor,21698