The rim you have posted a pic with the crack is a bad rim and we replace them at no charge under warranty.
The other rim you have posted looks like the replacement rim.
You should have part # 600718 on order, the part # never changed it was a running change in parts and production.
Also, when using the new style rim you need to discard the rim spacers behind the rim.
Last edited by mowerconsultant; 08-24-2009 at 04:40 PM..