You will need to remove your radio to locate the required serial number and part number.
1. Insert your radio removal keys
as shown, some Vauxhall radio models require you to remove 4 small studs with a (5/64" or 2mm) Allen Key before you can insert the release keys.

2. Press the radio removal keys outwards (as shown in the diagram above).
3. Assist the radio whilst using the radio removal keys.
