Ever wonder what's supposed to connect to the back of the coolant overflow tank?

[jbeez]

Wonder no more my friends, it was molded that way to fit in a power steering reservoir, Ford p/n: AG1Z-3E764-A

https://www.tascaparts.com/oem-parts/ford-power-steering-pump-reservoir-ag1z3e764a/?c=Zz1zdGVlcmluZyZzPXB1bXAtYW5kLWhvc2VzJmk9S0QwOTI1NTUmcj00JmE9Zm9yZCZvPXRhdXJ1cyZ5PTIwMTEmdD1zZSZlPTMtNWwtdjYtZ2Fz

I know that the livernois meth kits use a little tank for washer fluid and repurpose the washer tank, maybe this can be used instead of that small tank they sell, it clips right in over there in the same spot?

Figured someone might find this useful, I was curious so I just tracked it down.

[Macgyver]

I used that spot and the same designed spot behind the radiator to hold my catch cans. I did wonder what was designed by Ford to go there.