Second Alt and Batt

[PHOENIX]

I have thought about running a second battery and alternator.
The second battery and alt would be for accessories only.
When I have the lights on, sterio pumpin' and electric fan going there is a drain on my power system. The lights dim with the bass. I plan on adding some lights and maybe a few other electrical components later and think the more power the better. Plus with another battery, you can always use it if the first one dies. I need to get a better alternator, but I am interested in a second setup like I have as another option (probably cost more).

Anyway my question is does anyone make a alternator bracket (stock like) for the drivers side of the engine? One like stock, just a mirror image?
If so let me know where to find it.
Also I know I could get a battery and drivers side battery tray no problem.
So the bracket is the only concern as far as materials.