This will not fit older models, and you might need to replace the entire base. With this new version, the screw holding it on goes in upwards from the bottom. You will require the new version screw, part P87N if you are replacing the old version with this new one.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.