‘68 Master Cylinder question

Replacement master for 68 dart. Does this keeper stay on or is it just for shipping? Looks like it is to hold the piston in the MC. The master still fits flush against the firewall so there is no interference there.

If it does stay, does it take the place of this style piston stop?

Trying to make sure I have everything needed for the install.

My uncle bought a dart that had no master cylinder or pushrod on the pedal so I purchased this replacement and a pushrod from doctor diff. But if I don’t need the other style stop and boot I won’t buy them.

Thanks in advance.

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Are you willing to share where you found this? I searched with no luck.