I was lurking in the axis history forums looking for reference photos for my Panther customization when I saw this post of a very unusual panther. (credit to axishistory forum)
It looks like a regular late model Panther G with flame damper exhaust. What I find unusual is that aside from the flame dampers, it has the dual cooling exhaust stacks/pipes found in the Panther A.

I guess the Germans were not particular about attaching earlier/later upgrade parts on individual tanks??