I think I have a pair of Paddle Pushers (like new) that are too narrow for my heel. I wear a size 9 EE & a size 10 wading boot. I plan on working on & organizing my gear this weekend & once I find 'em, I'll measure across the heel & let you know.
PM me if interested. The price?......nothin'...btw, they work well for what you say you need.
Mike