Ralph:

The fan is new and unused, but the box has been around long enough that it's a bit tired ( just the box that is). The box set is for a K&B 1.0 motor, which I think just means it has a shorter spool on the rotor. I also have the long spool, which should be for the OS. I only put one DF unit together in a plane, and that was like 10 years ago. And it was a K&B. So, take a look at the pics and tell me if this is what you need.