If the car is not to your specification as a result of the dealer's error, then I'd say they're obliged to fix it (at no expense to you).
My other half ordered an Audi A4 Cabriolet back in 2002. After a 5 month wait it arrived but with the wrong satnav. She rejected the car and they had to order a new one which took another 3 months to arrive.
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