Wurlitzer MLM key

I am looking at a Wurlitzer MLM portable blue organ that I may purchase. It needs a black key. Syntaur does not list Wurlitzer parts. Can anyone confirm if any black key for any other brand and model will work in this MLM keyboard? Thanks for your time.

Try Morelock’s organ service

If I’m not mistaken it’s a Pratt reed type keyboard assy. If Morelocks Organ Parts in Rienzi,MS doesn’t have one , you might find an old Kimball organ that was built in the 70’s and the keys will probably be the same.