Sorry I took so long to reply. Been a very busy summer. 7.5 inches front to back and it's 31.5 wide. Hope this helps. My placement on the hood was solely based on any water that gets in being able to fall straight down without wetting the belt or accesories.
Hey Blown! I was looking at your GT-500 vent install and I had a few questions. Would it be possible to go a couple inches shorter than the ten you suggested for your install? I have a roush hood scoop on mine and it might be too far forward for the ten inches. Also, could you measure the width forward to back on the vent? I may be able to get it just forward of the scoop with the ten inches you suggested. Any help would be appreciated! Thanks!