here is a link to a pdf documment showing which iso adaptor lead you would require to fit an incar kit with an audio mute switch if so required
hopefullt this will help some of you whom have previously ordered the incorrect one

where is states 2 digit unit it means something like cd30
where is states 4 digit unit it means something like ccd2006

http://www.co-star.co.uk/images/pdf/VAUX%204DIGIT.pdf

hope this is of use to some/all

regards

Dez