I saw this at the bottom of the above auction:
If purchasing/planning to purchase swingarm spools for a 2010-2012 Z-1000, please first read this section carefully.
The 2010-2012 Z1000 uses a factory exhaust that is mounted very close to the swingarm, which is a moving component of the rear suspension. A swingarm spool on either side of the Z1000 is subject to contact with the exhaust silencer. The spools could disrupt normal suspension travel and cause handling problems with the motorcycle if contact is made between the spool and swingarm.These problems can occur under the following conditions:
1. Any rider weighing over 180 lbs
2. A rider/passenger combination, regardless of combined weight
3. A rider in a hard cornering situation or bumpy road, where compression of the rear suspension is greater than upright/smooth riding.
4. A bike using any type of lowering link on the rear suspension.
5. Conditions 1 and 3 combined
6. Conditions 2 and 3 combined
To avoid problems, if using a factory exhaust system, or any exhaust system with minimal clearance between the swingarm spool and exhaust silencer, only use swingarm spools while servicing the motorcycle and never while riding the motorcycle. Failure to follow these warnings could cause personal injury due to an accident, or in less severe situations, damage to the exhaust silencer, swingarm spool, or damage to the spool mounting point.
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I guess there is nothing to protect your stock exhaust without interfering with suspension travel?