Genuine Porsche PartCircular Base Mirror is the later style mirror found on all 924 and all other Porsches since 1978 up to but not including 996 and Boxster. It mounts onto a circular bracket that is glued to the windshield. Earlier vehicles may convert to this mirror. Circular bracket and mirror adhesive required for installation. Rectangular Base Mirror was used on all earlier Porsche models where mirror attached to the windshield. These mirrors attached with a double-sided self adhesive mirror pad. Universal Mirror attaches to any windshield. An attractive less expensive alternative, this mirror has day/night adjustment and comes with the epoxy needed to mount it. Learn More