I noticed that many Cup Racer owners in this thread have been looking for the Exotek Alloy Front Drive Cup. I did some searching online and discovered that they're available at DMS Racing, for a very reasonable price (IMHO).
I don't have enough posts yet to post the URL, but just search their site using "Cup Racer" and it should pop up.
I purchased one a while back and if I remember correctly w/ shipping to the USA it was less than $20.
I hope this helps a few fellow Cup Racer fans.