[minicoop900]

ok, now that i think about it, bmw wouldnt have put it in a box, they would mount it with a hold down and use a vent tube, and sadly the 323ti rear trunk pan is 323ti specific, so unless someone wants to order those 2 peices and modify their floor pan and weld them in, you have to do a custom box or something.

EDIT:
actually, the basic floor pan is the same, so if someone gets those tabs, bolts/welds them in and puts a vent tube, youd officially have an OEM rear battery.
double edit:
ok, the rear tool storage tray is different, so that would probably allow more room for the battery back there, if you want i can get a part # for the rear 323 tool tray.