There's a slot cut in the front of the can, and a hole cut in the bottom. I don't know what MM it is but it's 14.25" tall x 18.25" long x 8.25" wide. That's not my jeep in the photo, but I bought the same type of ammo can, and I'm in the process of making my own. I found mine at a local Army/Navy store for $25 (very good shape-no damage/rust). My center console consists of the auto/4 HI-4LO shifter colum and a single cup holder, no arm rest or storage. The can fits perfectly in that spot behind the cup holder, and doesn't protrude into the back seat area. And for me seems to be about the perfect hight for an arm rest. You can just leave it as is, or trim the back and install a hinge, then install a locking mechanism. There's different ways of locking it, here's a pic of a smaller box, used for housing speakers- showing another way to lock it.