The cup holder fits in the cubby hole thats in front of your arm rest.
If its like mine when the lid retracts it look like a small rubbish bin that you can remove. thats were it fits.
My front arm rest cubby hole is fitted with an air vent that is linked to the air con' so you can fit large tins (500ml) upright and have them chilled as you drive. Just right for my trip to S/France in June .