Look at some pictures of A-26 cockpits taken during WWII.
http://www.zenoswarbirdvideos.com/Im...A-26fInst1.pdf
http://ookaboo.com/o/pictures/pictur...ckpit_interior
I think the A-11 was a pretty standard Turn and Bank instrument used in a great many WWII Army Air force planes. There may have been some minor variations if different versions were used, but I suspect they were all interchangeable. I would not think that the A-26 would use any "special" or unique instrument.