There ya go
And as for a way to get it through the firewall, I found a rubber gromet on the passenger side about an inch in diameter. It's not used for anything (guessing for LHD conversions). Disconnect your battery, remove the top of the dash and the two console sections (upper and lower), then remove the side vent on the passenger side (the one that is hidden when the door shuts). I used a thin rod of metal to "thread" the boost line under the airbag area all the way over to the center of the dash. If you want some better instructions on feeding the line in and all, let me know and i'll write up a proper how to.
Last piece of advice, make sure before you cut the line (vac/fuel regulator from memory) that you have a t-piece that will fit, I didnt do this, and almost bodged the whole damn installation! All fixed now though
http://forums.justcommodores.com.au/showthread.php?p=490624