Length (front): 57"
Length (rear) 51.5"
Width (edge point to peak of spoiler): 13"
Width (center): 11"
Height (at mount): 4.25"
Height (center): 5.25"
Here's a link to some more pics:
Overall I'd rate it at 9.5/10, docking half a point due to a really small scratch on the top of the spoiler. I've shown a couple close ups of it. I am pretty sure it's fiberglass, but I don't know how to verify that.