EXT2Rob - Redcat does or at least they did have universal shafts for the EPX PRO. It was part number 08046.
I'm not sure if they still make them as there were early complaints of failures on the brushless models. There are a number of people that have used the Stampede Shafts to cure the issues. If you search on here you'll find a couple of posts.
http://www.rcuniverse.com/forum/redc...t-upgrade.html