Sioux Chief makes a replacement closet flange that allows for raising the height.
This is their 3" inside pipe version.
Where I started
A few shims to raise things.
The Push-Tite dropped in and snugged up with the closet bolts, washers and nuts.
In this case I was installing an adapter for a TOTO Neorest.
Replacing the shutoff valve.
Notch and install the skirt.
And done!

This is their 3" inside pipe version.

Where I started

A few shims to raise things.

The Push-Tite dropped in and snugged up with the closet bolts, washers and nuts.

In this case I was installing an adapter for a TOTO Neorest.

Replacing the shutoff valve.

Notch and install the skirt.

And done!