They are legal and yes you need the rear parcel 3rd brake light otherwise
you will get a yellow.

You can get a genuine one from Subaru or go to Malz etc and get a "Navara"
branded one for around $20.

With CF it's generally bonnets which are frowned apon as they will
shatter if in an accident and become potential deadly flying objects.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO