I dont own an astra, in fact I own a vectra b. However without the help of the extensive information in this forum I would have been struggling with a friends audio install!
His car didnt have the spare grommet in the drivers side so a new hole had to be drilled! And so was done
I would just like to say a big thanks to this forum and its memebers for making the info needed for me to complete the task available, for your viewing pleasure, a simple install I did for my friend
PS: The two tone power cable was an accident, ran out of red :/