1969 dual exhaust valence cutouts

Hi all,
My brother is currently working on a 69 340 Barracuda. As the po had previously fabricated a crude rear valence for it, I gave him one I had removed years ago from a 67.
The one I supplied only has the round frenched cutout for single exhaust, and he is looking for the dimensions to cut out the dual style.
Can someone provide measurements for these?
I am thinking the
Spacing between the two.
Length t and depth of the cutout.
Radius if possible of the top cut.

Thanks in advance
Grant