Tesla says the purchase will help it increase production as it introduces more models. Riviera can help with building of new plastic parts and new metal-forming development, a spokeswoman said. The Detroit Free Press says Riviera may be renamed Tesla Tool & Die. Kelley Blue Book analyst Karl Brauer says he expects more acquisitions by Tesla.
Currently the Palo Alto, California-based Tesla sells only the Model S sedan, but it plans to start selling the Model X SUV by the end of September. A $35,000 car is coming in late 2017. Tesla is predicting that it will sell 55,000 vehicles this year.
Under a law passed last year, Tesla can't sell cars in Michigan. The law requires automakers to sell cars through franchised dealers, and Tesla sells cars directly and not through dealers.
The AP contributed to this report.