more Questions about the F430 (Toblerone Race).

1)Imca Rules : Parts to be used : D6,D7 ........ L5,L6

For me this parts the same (one pair is black the other pair is red). How to use all 4 of them? maybe I am wrong but IMHO this makes no sence.

2) I am using the Lexan Parts from Nick. At the front windows there already Parts B1,b2 included. Is that good enough or do I have to use the plastic wipers?

thx for any help - I am getting mad in the moment