Bob, I have to press because I haven't seen a response. The K1 kit you got form MB had plastic parts that hold coaxial springs. There are no such parts in the Superior kit but it claims to have all the parts needed to improve shifts. Do you have to separate and reuse the plastic K1 spring retainer when installing the Suprerior kit or does the Superior kit rely on an intact factory K1 kit?

Thanks,
Sixto
87 300D