I am talking sauron though fitting this kit right now and have made progress, i bought a standard boss kit of the same seller last week and fitted it very easily with no major mods.hopefully we can get the snap off one to fit in the same way.
The part of this boss kit that gets in the way is just a plastic horn contact disc that is not required,because the car has one fitted already(the block thats in the way) you just need to pull the bosses contact disc off. I have seen posts of other boss kits that needed to be drilled and cut etc, but i assure you this isnt nessesary with this kit. Sauron is giving it a go now, will let you know the outcome