Mirrors look really good, I can't help but think a LCR splitter would finish it off though 
+1
Holes are on the underside anyway aren't they?
Won't be noticeable if you balls it up.
Tigerseal with a couple of self tappers should be enough 
Looking nice wayne, although not sure on the black wing mirrors, it makes it look poverty spec. 
another big fan of LCR splitter here
consider is more wayne

Thats the problem, no holes, I was not keen on drilling 12 + holes in the new bumper after it it cost me over £300, the other thing that dad pointed out was that I you hit or catch it you could do a lot of damage including breaking the bumper also as Rhyso pointed out they all seem to have them these days.
The mirrors were in a poor state with lots of marks so this was the cheapest / quickest way to sort, I may in the end switch them back to silver.
Once the black theme is extended, I think they'll blend in nicely.
Perhaps with the inside of the lights painted black to reduce the chromeness of the whole thing.
The plan is satin black roof and then black wheels.
I am aiming for a oe+ look in one way or another.