Not all I for one, even though I say it myself
Although I dont make anything for the supra, I make quite a bit for the MR2.
I make sure everything fits right before I make moulds.
All my stuff has fixings bonded on the back where necesarry or predrilled holes (MR2 bumper has 13 nuts bonded on the inside across the top/bonnet edge)
This is where a lot of companies dont give a damn and turn crap out.
Anyway as has been said mark where hole needs to be in the bumper,drill and bond a nut on the reverse side then all you have to do is screw a bolt in from inside the wing.
Shame you dont live closer and I would sort it for you for free.