IRC the object on the rear of the turret of the 222 is the radio ariel ( sp ? ) base , as the radio was located in the rear of the turret . It was one of those small ones ., like under the dash board of the 251 . The tube on the side of the engine right would be some kind of pre filter for the air intake , probably a retro fit for the sand / dust found in Africa and Russia . The Stugs IIIs used in Africa got the same kind of up grades with filters on the rear fenders , IRC there was a Tropical version of Panzer III and IVs produced with better internal filters , I guess the cars had no room in the engine compartment for them