This came in just as ordered, but I ordered the wrong thing. Luckily I asked the people at D&M and they said they could do a custom pen holder, so I did that as well. I recommend just doing the custom order unless you are confident that the standard size will work. My notebook was slightly bigger than this standard size.
Plus, when I did the custom order, I got the pen size customized to hold my slightly larger pen, and I got 2 pens in one holster, which is great.