You keep the air filter and mounting hardware, they send you a brand new shiny motor in a nice little box. This is the new motor that they sent me.
It was the tightest motor that I have ever seen. We had to heat it up with a hair dryer and break the seal on the glow plug just to get it started. Otherwise the compresion was so tight you couldn't even pull the starter cord.
But I will say this, now that it is broken in it runs like a bat out of hell.