Ok, so I just measured the B14. It appears Lynch was spot, the B13's are nearly identical. it's 2" from the top of the IM to the hood. 2" from the back of the IM to the lip on the firewall and 2 3/4" from the IM to the part of the firewall beyond the lip that sticks out a bit (hump). Hope this helps. I'll be wrenching in the garage these next couple days if you have any other questions or need pics.