Ok, so here's what I got. I thought I'd approach this a bit differently than Gus, as I have the advantage of having a spare piece of original bird glass from which I could measure from the bottom.

This pic shows that, from the bottom edge of the tail (taken from the exact centre of that edge) to the bottom edge of the glass, it's exactly 7 " :



There are 4 holes that are used to mount the window to the regulator. The assumption is that the placement of these holes should be consistent with the placement found on the reproduction windows at ACC. I think it's a good assumption, as the window wouldn't otherwise line up with the window frame when installed.

From the right-centre edge of the 2nd hole from the left (keep in mind this is a RH piece of glass; it would be left-centre edge of the 2nd hole from the right for a LH piece of glass), I ran a piece of tape horizontally, intersecting with a vertical piece of tape whose left edge ran to the exact centre of the bottom of the bird tail. The horizontal measurement is 1 3/8" (from the right-centre edge of the 2nd hole to said intersection), with the vertical measurement being 2 1/2" (from said intersection to the bottom-centre edge of the bird's tail) .

Then, I ran a piece of tape to the tip of the angled front edge of the glass. From the left-hand edge of the vertical piece of tape that aligns with the bottom-centre of the tail to the very tip of that angle, it measured 4 15/16" . Here are 2 pics taken at different distances to demonstrate this:





Finally, here's a close-up of the actual etched bird, along with a pic which attempted to show that the measurement from the upper LH tip to the upper RH tip of the bird's wings is exactly 1 11/32" . This measurement should provide the means for ACC to get the correct size for their stencil, in case they misplaced the one created when I had my glass done:






I suggest right-clicking and doing a "Save As" for the pics with the measurements, as that will allow you to zoom in once saved to your PC.

Let me know if you need any more info or pics.