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some dealers might have contacts to have them shipped, but i'm not sure who in particular to ask. i know the dealer closest to me does not want anything to do with aftermarket parts for the F, so i've been asking around. but from what i remember, two members (12chard and K3RRY) have it installed, and i don't believe they had any bumper cutting to install those diffusers; just a simple add on from what i know.
As far as fitment goes: it fits on the factory rear bumper with double sided 3M tape and from the underside using the factory push pins. Absolutely no cutting or drilling.