It is quite simple to remove your SEAT radio. You will need t a flat-head screwdriver or a prying tool for prying the panels off the dash to access the radio.
In some cases you may need radio release keys to remove your radio from the head unit.
Once you have the radio release keys, push them into the 4 holes in each corner of the radio (See image), apply a little pressure and the radio will release from the dashboard. The radios label will be located on the radio's casing.
SEAT radio serials are 14 digits for example SEZ1Z3F6412082. Please see image for reference.
If the label on the radio is damaged, on most SEAT Ibiza radios have the serial compressed into the metal casing. As shown in the example image, the serial is engraved in the casing above the sticker-label.