You could check the dimensions of the Kobo against those of the K3, or you may want to consider what I did. I bought a Nook (original) and an Oberon cover, then decided the Nook wasn't for me. But I loved the cover, so when I bought my 3rd generation Kindle, I modified the cover to fit the K3. Of course, it helps that the K3 is smaller than the Nook. Here are the results:
Admittedly, my stitching (I had to use a leather awl) is not up to Oberon's standards, but it proved serviceable:
I added a wrist strap (from a camera that's no longer serviceable) to keep it from dropping on the floor should I fall asleep while reading.
As you can see, the outside is still all Oberon.
By the way, if you're wondering where those numbers came from above the keyboard, that's a decal a friend made for me.
