Hi, I feel like an idiot for my confusion, still new to the sport. I have a 2012 Cervelo P2 and looking at some Zipps for sale locally.

The owner messaged me and confirmed they come with a 11s cassette and haven't been used since 2016, so I assume they were made slightly before 2016.

I am wondering if these wheels will fit my 2012 P2? I realize I would have to upgrade to 11s group set and I would probably lean towards Di2 if possible.
Or would it be possible to use these wheels with my 10s cassette + a spacer?

Thanks in advance.

Zipp Firecrest aero clincher wheelset - bicycle parts - by owner - bike sale - craigslist