Probably the most important part of the conversion. So many "issues" are caused if they are not perfectly correct in several areas. Firstly they need to be the correct length to within 1mm and there are not only differences between the S1 & S2 lengths, it is even important that the ride height is taken into account too. Ours are made only for us and ALL our parts are new - nothing is reconditioned.
Because it has taken a lot of time and effort to design and develop these, we will not go into fine detail, we will simply say that the material we use is the strongest steel available then induction hardened, the splines are cold rolled (best possible), Our joints are bespoke and made specifically for us with built in speedo ring gears, they are much more robust and stronger than OE. The bellows are neoprene not the "cheap" rubber type, even the grease we use is the best (and most expensive) available.
All this has been achieved through many years of trial and testing on the race track predominantly and also with the experience within the fitment of over 100 conversions.