My feet are wide and flat as a duck, and I always have trouble finding comfortable footwear.
I used to have a great pair of Engineers boots.
These were comfortable and they were the first boots I wore out.
I have been looking on and off for these for about a year.
13EE or 13 XXwide is all I can find.
I would suggest calling the manufacturer of your old boots or checking with the popular brands. Shoe repair places might be able to order them in for you too.