Below is some examples of the car sizes to help you figure out which one yours falls under:

Small Cars Include:

Fiat 500, Citroen C1, Toyota Aygo, Vauxhall Adam, Smart Car, Mazda MX5, Toyota Yaris

Medium Cars Include:

Ford Focus, Mini Cooper, Ford Fiesta, VW Golf, BMW 3 Series, Saab 9-3, Mercedes A-Class, Mercedes C-Class, Mazda 3, Vauxhall Astra

Large Cars Include:

Any 7+ seater, Land Rover, Range Rover, BMW X5, BMW X7, Pickup Trucks, Nissan Qashqai