Does anyone know anything about the spring listings in the manual for the 411? I had a look through and there are three springs with "L23 TC(2)" as part of their description. These springs are not on the list for the optional spring kit that is for this car on the serpent site. Are they specific to fill the "gaps" between the rates on the standard kit? 13.0-16.0-19.5 is rather large jumps for EP TC touring cars on rubber.