The all have the same 9.75 x 4.25 gray base. They are the same width and depth.
They all stack, but these 6 in front are sjorter at 3.75 tall as seen in a few of the pictures. All are in great condition. A few have marks on top from the wheels of a car being displayed on it.
Most have the typical marks on the bottom gray part where the wheels of the displayed car touch them. 16 wire ties to hold vehicles in the display cases. Throwing in one action display case with a black base.