Chance XL base dimensions for custom harness?

Hey guys,

We are having a custom harness made for a Chance XL. I haven't received the toy from BD yet and their site doesn't list the dimensions of the base. I already have a chance L. Looking at the photos, the size difference in the base/testicles between the L and XL looks significant. Can anyone let me know what these dimensions are? Ill post a few pics of the measurements I need (taken from the base of my Chance L - excuse my dogs hair haha). Thanks!