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Used Tesla prices tumble as embarrassed owners look to sell
(arstechnica.com)
This is a most excellent place for technology news and articles.
You can still get aftermarket parts for Pontiac vehicles. Then again Pontiac didn't go around suing everyone who even thought about making aftermarket parts for their vehicles.
Pontiac was a part of GM, who standardized most parts across all their brands decades ago.
There's no parent company for Tesla.