I don't know what these cost, haven't done any searching yet, but a 'fuel cooler' from a ford 6.4 looks appealing to me.
https://www.partsgeek.com/gbproducts...-05445743.html
from mount to mount is 21" and it's 9" tall.
The OE one has more fin density than the Dorman one, just going by the Dorman pic.