That's what I was thinking but looking into it farther I saw the one style and then an updated one.
That one is tough though since you can't get to the outer seal with a tool because it's under the edge of the piston.
The way I remember was to move it around in small circles while pushing down on it, or freeze it first.
Here's what I found when looking for pics of the two.
I think what they call the wider one is the one with the short lip on it
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