Where to buy F1 Barcelona Parking Tickets

My wife got me for Christmas F1 tickets for our very first Grand Prix and we are very hyped for it!

Now we struggle to buy parking tickets at the circuit, found this website (https://www.ticketsgpbarcelona.com/f1-parkings-montmelo-2026,35.html#forMobile) but it’s not really helpful and a bit confusing with the dates. I also checked the circuit homepage but can’t find anything about parking.

Anyone can help with past experience when they go on sale and if they sell out fast?

Many thanks in advance.