Nobrow submissions?

I've just been looking at submissions to Nobrow, because I think my concertina book would fit with what they sell as they have a range of similar concertina books. But when I looked through the submissions specifications they only had two options of books to submit. One was short-form comics with very specific page numbers and size and the other long-form comics and graphics novels... my book doesn't sit with either of these but they seem to be the only options for submissions, so I'm not really too sure what to do. Nobrow definitely stock this kind of book though so I'm not sure how to go about contacting them about it... I might just send it anyways...