I bought Husky springs from RockAuto in 2017 and put them on my F250. I wanted a little stiffer spring, so I got ones that were rated higher. It looks like RockAuto has some 1655#, 1700#, and up available. No complaints about the Husky springs to date, although the truck only sees occasional use and towing.
On RockAuto's site, the Husky springs that I put on my 2wd F250 do have an part number interchange listing, so you may be able to locate the Ford part numbers in the catalog for your truck:
OEM / Interchange Numbers: 20260, 431111, E3TA5560UA, E3TAUA, E3TZ5560M, E4TA5560SA, E4TASA