YHR
I thought I could offer some info...but of SEVEN very thorough reference books I have on German armor, every detail is given on alll models of the Sturmgeschütz EXCEPT lateral movement of the gun! I have been in several and the 75mm will traverse about 15-20 degrees left or right. Seems to me, that the earlier Stu III models had more movement to the right than the left. The driver was pretty much an auxilliary gunner, getting it close where the gunner could make the final lay. The longer L 33 gun models had a longer recoil system and could not elevate as high as the shorter L24 gun, but lateral traverse was about the same.

Bill