Yes, you can select extras such as baby seats, child seats, booster seats, additional drivers, the cross-border fee, GPS units, and so forth during the booking process. If you don’t see any extras available on the optional extras list when viewing the offer, you can simply add your request when filling in the driver’s details by leaving a comment in the additional requirements. 

You can always ask if any particular extra is available when you pick up the car.

All additional extras are subject to availability when picking up the car, and their costs are fully controlled by the suppliers and may change at any time.