Also, on the parts. Parts are hard man. Since about 2018-2019 mfgs make it hard to get OEM parts after the model is out of MFG warranty, usually like 5 years. After 5 years sometimes even dealers have to go aftermarket. Even oem parts suck too now-days though. Blame mfgs or mfg parts suppliers idk. But what I can say is that Bosch is usually pretty good. If you have a car (usually foreign) with Bosch equipment, they make it easier for distributors to purchase. While they do have multi-million dollar minimum purchase orders, they almost always have 20+ parts available though some part of their network in my experience.

Navistar/International, CAT ,(Ford diesel engines), (mostly diesel engines) use a healthy amount of bosch components that can be sourced. A B2B that offers some retail purchases is Alliant Power (they're called something else now, again parts is a fucking mess after 2020)

Really the only US domestic parts sources are like Dorman, or Cardone Group (I think they even merged now idk). There are some others but mostly just resell dorman or cardone white-label parts. Denso for asian stuff (high quality usually).