I dont currently have one apart. They are a pain to disassemble to take pics. If I have time this week I will try and get some photos for you.
I was going to bid, but it just looked like to much work, more than I wanted to do....LOL
You can buy a square fan from radio shack, hold it up to the grill where the original mounted and drill small pilot holes into the square fan. Then screw the original screws into the pilot holes with some loctite or equivalent on the threads.
Your done with the fan.