So I got the tank, but I did not get the ring.

Seems these fancy new plastic tanks need something to fill that big hole on the top.
and a locking ring to keep everything in place.

The guy I got the tank from, had the wrong ring, but said he would look for it.

Patients is NOT one of my virtues.  …..   not at all

Checking the auto wreckers, I was able to grab a ring.
Made it home a few hours later.
Apparently, they are NOT universal.
Really….   REALLY???
C’mon….   It’s a 6 inch plastic ring for dog sakes.

Back and forth over the next few days….

FINALLY I find one that fits.
AND it happens to come with cap as well which holds the pump and the sending unit.
So I guess it was worth the hunt.