[x2495iiii]

There might be one in the sketchup warehouse. Plenty of tutorials here and on youtube on importing sketchup models to Alice.

You could also try making a texture for the rectangular prism object. I did a similar thing when I wanted a death star. Just found a texture I could stick to the sphere and bingo.

Finally, you could see what Google has to offer. I found this, but it's not perfect.