These panned panels come in odd sizes.
The first two each measure 16 1/2″ wide by 4 3/8″ tall (image area).
D3 is 6 1/2″ wide x 14″ tall and has white paint repair on two vertical lines about 12″ long inside the guillotine. (Still a good page, though.)
The Dead End page is 16″ wide x 9 1/2″ tall.