Here is a photo of the T26E4. The 90mm gun on the M26 was still inferior to the German 88mm and the British 17pdr, so the Americans developed a longer more powerful version called the T15E2 90mm gun. This gun was fitted to the T26E4 tank. Only 25 of these tanks were built starting in March 1945.
There was a show on History Television a few months ago, about US Army combat photo units. I think it was called “When the War Came to Germany” or something like that. There were two teams of camera men in Köln Germany when the Panther was KOed by the M26 near the Köln Cathedral. Below is a still from one of the films they shot.
