CasioMen's Pro Trek

Q: What glass cover would fit this watch?

38mm screen protector works. You have to get it exactly in the center or it will bubble. 37mm works, but you will have a slight gap around the edge that will accumulate dirt and grime. A 3 pack of the 38mm from Amazon is less than $5 from a company called Zshion. You definitely want the 3 pack because you'll probably mess up applying it the first time. Tip for applying it, if you put it on the watch, and it isn't perfectly centered, don't just toss out that protective cover. If the watch glass is clean, you can unstick and re-stick a few times and it won't hurt it.

Q: Cant find a new arm band for it? What's the part number?

The only thing I could find was on the case. Multi Band 6. I did hear once they use one pin size to fit most of the watches, you would need to E-mail Casio, hope this helps.