Porsche's Certificate of Authenticity (and even modern Porsche Classic Technical Certificates) systematically lists rain-sensor option XD3 and self-dimming-mirror option XE3 on cars that do not have them. BillG993 documents this is so prevalent that 'it seems like it must be a systemwide error'. …
Certificate of Authenticity errors — systematic factory documentation flaw
Porsche 911 (993) · factory-spec