Aftermarket radio

Hello,



First of all sorry for my English... :o but i cant speak German.



first let me introduce myself my name is Eric Osman and i'm from the Netherlands. Sinds 2 days i'm a proud owner of an Audi A2 1.4 Diesel ( From 2000 ).



Now comes my question :

I would like to install an aftermarket radio in my car. My car has a Blaupunkt thing under the passenger chair ( i guess for the back speakers ? )



now i think i need : Radioeinbauset Radioblende+Aktivsystem- & Antennenadapter für AUDI A2 A3 A4 A6 | eBay



But is this right ? and do i need something else ?



Thank you very much!