Just got off the phone with Tom at SMC. He is willing to build a batch of complete axle clutches if he has 25 people on his list to buy them. No deposit required. He currently has 6 people on the list. If he can get 50 people on the list, he will improve the design to address some issues that the Road Race community has or basically change the design so it is specifically designed for Road Racing.
Just drop him an email at tcf@kartingclutches.com & let him know you are interested.