The reason for the different shock towers on the 8.2 is to lower the shocks so we can use the normal shock ends instead of making longer ones or using them from a different manufacturer.
The RPM arms will not work with the associated upgrade towers. Like someone else said, the shock risers are built in on top of the arm.
At this point, in my opinion, wait for the new car so you'll have a fresh kit with EVERYTHING. Not many distributors, if any at all, have the upgrade kits in stock. By the time you get everything, the new car will be out.
Try checking out the 8.2 thread and the RC8B thread for more info on this. You'll find all you're looking for in there.
