Could not tell you what brand it is but I purchased it and my deck installation stuff at Best Buy. There really is no upside down or right side up, but as you mentioned its a matter of preferance.

91Trojans: I did not have to modify the door at all. I did have to make custom adaptors out of plywood so the speakers would fit in to the stock door openings. Not that hard to do if you have a jig saw and a dremel tool.