Cheers mate! 
also do they have to be installed a certain way up? Mine have number on the backs so I'm guessing they should just be installed with the number the correct way up?
Will be giving these a go on Saturday anyway
In the meantime mate, you got any idea where and how I can test them around the house before putting them in the car?

Will be giving these a go on Saturday anyway

In the meantime mate, you got any idea where and how I can test them around the house before putting them in the car?