There's no way they can make a car in which the normal wear item's aren't used elsewhere. A Tesla would cost double if all the parts were built specifically for them.
You might have a problem finding control arms and body panels if you're not a shop but I'm betting tie rod ends, wiper motor/arms, wheel bearings and brake parts are all common parts or very close to existing, common parts. The CVs and steering rack are probably hybrids made from existing components in the supplier's inventory but specifically assembled in that way for Tesla's application. SpaceX makes a point of using off the shelf parts where possible to reduce cost. I would be downright surprised if Tesla didn't do the same. It's in the best interest of any low volume manufacturer to use off the shelf parts wherever possible. The lower the volume the more this is true.
For example, one of the higher end Toyotas (I forget if it's the Avalon or Solara) uses the same Bose sound system as a handful of Maseratis. Some Rolls-Royces use a smallblock Chevy starter motor. The Dana 44 rear axle as been in everything from pickup to luxury sedans to Zambonis to forklifts. A part is a part, an assembly is an assembly. If exactly what you want isn't out there already then you work with the manufacturer to have it made. You don't reinvent the wheel unless you have a very good reason.
There's also a robust aftermarket of 1st party Telsa parts that have been scavenged from totaled vehicles. If you are willing to pay for a part, you can get it.
You might have a problem finding control arms and body panels if you're not a shop but I'm betting tie rod ends, wiper motor/arms, wheel bearings and brake parts are all common parts or very close to existing, common parts. The CVs and steering rack are probably hybrids made from existing components in the supplier's inventory but specifically assembled in that way for Tesla's application. SpaceX makes a point of using off the shelf parts where possible to reduce cost. I would be downright surprised if Tesla didn't do the same. It's in the best interest of any low volume manufacturer to use off the shelf parts wherever possible. The lower the volume the more this is true.
For example, one of the higher end Toyotas (I forget if it's the Avalon or Solara) uses the same Bose sound system as a handful of Maseratis. Some Rolls-Royces use a smallblock Chevy starter motor. The Dana 44 rear axle as been in everything from pickup to luxury sedans to Zambonis to forklifts. A part is a part, an assembly is an assembly. If exactly what you want isn't out there already then you work with the manufacturer to have it made. You don't reinvent the wheel unless you have a very good reason.