Simple Countach question - please give me an answer!

I have asked this question before but got no replies but I'd really like to know the answer.

Can any Countach owner please tell me the dimensions/measurements of the rear, rectangular panel where the badges are fitted on the Countach? I've been a massive Countach fan all my life and have a complete set of genuine badges that I want to mount and hang on my wall. This is the panel between the rear lights under the boot lid.

Thanks

 

Omg! Thank you so much. I will post pics of my finished piece of art! I really appreciate you guys taking the time to do this for me