Feed up with the puney mk2 horn (and that it doesn't currently work) so I picked up the twin horns from a MGF
I flipped them over and drilled an extra hole in the brackets so I could fit them slightly proud of the radiator. I have fitted them where the upper mounts of the O/E airfilter housing bolt using the MGF bolts as they are shorter and wont dig into the top of the radiator.
Next job is to wire them up.