Glenwall wall mount toilet

[chuck1]

I need to replace my wall mounted toilet soon and have been reading the threads on the
Am St wall mount and am concerned re: leakage between the tank and bowl. My question is, can I use the old tank on the new bowl?

[Terry]

My question is, can I use the old tank on the new bowl?

No.
The old Glenwall was a five gallon gravity tank and bowl.
The new Glenwall is a 1.6 gallon pressure assist tank and bowl.

Even if you could mount the tank, what happens when you plug the bowl and overfill it by a few gallons.
Just pick up a new Glenwall, and allow time in case you need to do some bowl and tank swapping until you get it right.