Had mine done at Porsche Austin a couple of weeks ago. They had to have the VIN to order the parts as they're vehicle specific and PCNA wants to know what car they're going into. Took 3 weeks to get the parts in stock, dropped off car and repaired a few days later.
Closing the loop here, the dealership confirmed visually that there is no wiring present in my 2022 CT4 built with the base stereo to connect to the Bose amp.
I see this thread has stagnated a bit but no other new ones and I'm about to undertake exactly this work. I bought a Bose amp from a dismantler as well as the Bose sub, similar to the one above. My local dealer hasn't done an "upgrade" from base to Bose yet but asking around internally, no one...