H22Si

I was wondering if anyone knows the diameter of the stock P/S pulley on a '00 Civic Si? I'm considering adapting a Vortech B-Trim to my H22, using the P/S pulley section of my Unorthodox crank pulley to drive the SC. Since the P/S section of the crank pulley is underdriven, i'm trying to find out the difference in size so I can compensate with a smaller SC drive pulley, attempting to maintain 6psi without underdriving the Vortech. I work in a CNC shop so fabrication of brackets, bolts, ect. isn't a prob.

Any insight would be greatly appreciated.