WallyP

As Jim says, many of the "options" were "free", so it was buyer choice.

Since most cars were dealer orders, the dealers took everything that was free. If an buyer ordered the car, they could pick and choose - if the dealer told them that they had a choice...

Vilhuer

And when dealer told sunroofless car could take extra three months to get choice was fairly easy to make for anyone who fits into sunroof car.