We do not show this being compatible with the Quantum 600. Please give us a call at 1-800-798-0325 or email us at contact@monsterscooterparts.com with your serial number and we can see if they would be compatible with your specific power chair, or if there are any alternate options available.
Is this the same for both left and right sides?
It does not appear that this actuator is side specific, but if you would like us to make sure, please feel free to contact customer service with your power chair's serial number by email at contact@monsterscooterparts.com or by phone at 1-800-798-0325.