I have found one picture showing a carbon fiber bumper to protect the front spoiler:
but this bumper is not included on the kit DoSlot sells, maybe we need to contact the fella and ask for it.
Anyway, take a look at this link: https://picasaweb.google.com/109586671652648536965/DoSlotFormelZ#. Do the F1s seem a little to short and too wide?