I want to say it's an Odyssey PC680 or 980 or something. (EDIT: PC925) (EDIT2: just realized you probably meant dimensions - here you go:
http://www.odysseybatteries.com/battery/pc925.htm )
Should fit either place, we put it there for weight reasons. Location is kind of a preference thing, I don't love it in that position but I am not going to lose sleep over it.