Around 85% of the parts that are used to build a NASCAR Cup car must come from a single-source supplier. Teams are required to use these parts as-delivered from the supplier.

Musk said Tesla now has enough parts to build 10,000 to 12,000 robots this year, but since it's a new product, the goal is to make 5,000 this year. It hopes to reach 50,000 units next year, he added.