TEST FIT EVERYTHING TWICE BEFORE DRILLING ANYTHING! just a rule of thumb.. I was pretty upset when I had my evo2 spliter painted and the body shop did not even put my rubber popout pins back. I was pissed.. but I would try to attach the pins without drilling any holes.. if you have to drill use a bit that is just a bit bigger to prevent that you dont make a hore out of you new spliter!! good luck