Check towerhobbies.com and look at the rc parts superstore. They'll be able to give you a part number and a stock status. If its discontinued, then take the part number and do a google search.
Thanks for all the comments! Think I'm just going to buy a rotary wand on ebay for $5 though, and then what rotary start back plates would fit the engine? Any links to ebay? Sorry for all the newbie questions.