If it isn't readily apparent by merely glancing at it by the operator on the line? Auto manufacturers do not have an army of receiving inspectors closely examining every single part to see if it meets requirements. They receive the components, move them to the line, and install them on the cars. Suppliers are expected to provide conforming product. Period. If they don't, they will be forced to hire a third party company to inspect the parts and pay those costs which gets very ugly.
The contracts between manufacturers and suppliers dictates price, specifications, quality, volume and delivery requirements. An auto manufacturer generally will place orders 10-12 weeks in advance for "x" number of pieces. The supplier accepts the contract through negotiation. Suppliers are eager to win business, so there are likely several bidders. It can be a very tough cutthroat cyclical business with low profit margins and hi pressure environment.
IF the supplier is behind due to machine downtime, excess scrap, staffing shortages, or a myriad of other issues, they are the ones expected to pay extra for expedited shipping. Not their customer, they just want good parts on time, like they ordered per the contract. Not days early or days late, but when they need them.
If they were to shut down Tesla's assembly line by missing a shipment, the costs would be millions and Tesla could charge that back to the supplier. Expediting parts under those circumstances isn't even a tough decision to make for a supplier. Seriously, do you expect Tesla to shut their line down and lay off thousands of workers because a supplier misses shipment by not expediting?
I spent 30 plus years working for several suppliers in a quality role, so I have extensive knowledge of this scenario. Just curious if you work in the automotive manufacturing industry ?
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