Steeing Coupler Seal

I'm in the process of replacing the power steering gear on my'65 Barracuda. I noticed the seal for the steering coupler is rotted. There is what looks like a seal cup that fits over the end of the steering column tube. It appears to be part of the coupler seal. I have found several places that have the coupler seal in stock but without the seal cup. What's the story of these parts?
These what you are looking for? There is also a coupler rebuild kit with a new spring and shoes. This is on Mega Parts USA site.

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