Current cybersecurity standards enforced in the automotive industry will probably completely kill the possibility of after-market car parts and the usage of used parts in cars. I say this as someone working in this field that has asked a couple of people doing work in this exact direction. I point blank asked them if this will happen, and they just shrugged their shoulders and said... yeah, kinda'.
https://www.ftc.gov/system/files/documents/reports/nixing-fi...
https://www.sema.org/news-media/enews/2023/28/right-repair-a...