This mount is designed so you can use an E90 coolant tank in place of the windshield washer fluid tank on an E46. This is not a plug-in play item as you will have to drill two holes in the inner fender to mount the tank.
I designed this on my forced induction build to eliminate the possibility of the standard E46 coolant tank exploding under pressure.
this is just the amount for the tank, no coolant lines are included.