The items that fit your Volkswagen Polo Mk IV are shown below.

Volkswagen Polo mk IV (9N) forth generation

Production years 2002 - 2009

The forth generation Volkswagen Polo had a facelift mid production around 2004. The earlier models had original tape cassette headunits with optional CD changers, these cars had ISO connectors at the back of the radio. The later facelift models have a double DIN sized original CD player head unit, these later models have a Quadlock connector at the rear of the radio.

It is very easy to differentiate between the pre and post facelift models by looking at the headlight styling, see the below picture.