This is where mine is on the passenger side, behind the light unit and down bolted down using an existing 6mm bolt hole and then tie wraps round it just so it does not bounce around. The drivers side is in the same location but you'll notice that the existing hole is being used on that side as an earthing point, but you can still use it.
You'll have to bend the brackets to make them fit, but they bend very easily.
Or just put them where dogsbody has, actually on a side note graham have you noticed if yours interferes with radio reception, listening to a disc or mp3 player plugged in everythings ok but switch to the radio and it struggles to tune in. Good job I hardly listen to the radio
.
Paul.