CLK? Around the 2001 mark.? I am looking to buy a 2001 Model CLK Convertible and I notice some have the Mercedes Comand system fitted (Double Din) Can the hole in the dashboard fit a standard Double Din Unit?

Yes it will fit but you could have problems as the command system could be fibre optic which will cause problems. If its not its quite a job and a strip down to remove it but enjoyable

i have no idea
look on wikipedia