This is what I've come up with so far. I still need a top and bottom diameter of the stock cupholder. I can adjust any dimension on the part for different cup sizes.
If anyone wants to make one of these I will be happy to change the size to fit your needs and email you a file that you can send to a 3d printer. There are services online that print your parts(I've used shapeways.com, just got a couple parts from them and I'm very happy with them). The cost for plastic from Shapeways.com is about 34$ plus probably 5$ shipping. If anyone has questions or suggestions I'd love to hear them