Kevin,
Actually, these are street sliders. No drilling was required. But, like you said, the street slider isnn't that big. So for extra saftey, I added the clutch slider. The clutch slider is the slider right above the foot peg. You can pick up a clutch slider for $60 all over the net. Just do a search for clutch slider. I bought mine off ebay. /images/icons/smile.gif