Originally Posted by
chrisimp
Comparing pro 4 and 5 it's easy to notice that the dimensions are the same! In fact mine is currently fitted with some graphite ones, here's a few photos also of the steering block which looks comparable too!
Even the PRO 4 C Hubs are getting hard to find - I got 1 set here and had to go overseas for the others. Tower is supposed to have the new PRO5 C hubs back in stock (along with other parts I hope) - those C hubs are not supposed to break as much as the stock ones. Looks like even the HB C hubs from the TC series of cars will work, you just don't need to set screw.