Luciano were do you get the Novak HV 1.5 and 2.5 from ?

I have looked but cannot find any , lowest i got was 3.5 . Did you go with the Novak HV because it has a 5mm shaft .

I found the Tekin in 2.5 but don't know if it has the 5mm shaft . I'm thinking the 5mm shaft would be of benefit to a speed run car .