25 T26E3s were converted to T26E4 Super Pershings with improved gun mounts that eliminated the need for the stabilizer springs.
And now we can have that in the game!
To do this..
Back up your Pershing's directory
(Typically c:\games\world of tanks\res\vehicles\american\A35_Pershing
Open up the A12_T32 folder, click Normal, lod0, and copy the following files:
Copy these files somewhere save..desktop or something. Rename them Turret_01 respectively (Or keep them Turret_02 if it's the 2nd turret you're replacing on the Pershing)
Copy the renamed files back to the res\vehicles\american\A35_Pershing folder, and if you backed up the directory, replace the files.
Fire up the game, and now you've got a (more) visually accurate Super Pershing.