I read on the website that it has a 39 mm case so that will do. There were quite some comments on the 36 mm case being to small, so this will satisfy a few customers. I have to say that I choose the II over the I for one reason because of its size. I love the Explorer II, but maybe today I would choose different. Furthermore I am glad that the Explorer I kept its great understated looks.
Best,
Starman