Well, looks like another documented resource issue...LOL...what can we do...LOL...
The ultimate resource for anything remotely involved with the Patton development would be in "Patton A History of the American Medium Tank, by R.P. Hunnicutt". That guy puts insane amount of detail into his books. You name it its in there. Unfortunately, it comes at a heavy price. A new, if you can find one, is around $90.00, or least it was I was looking around it. I currently don't have the extra funds to drop on a book...
If anyone has this book on here, look up the dimensions at the back of the book for the M26 (T26E3). It will give us any thing we want to know.