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.
Out of business 30 years ago.