CHECK SIZE - New Replacement Mirror Glass with FULL SIZE ADHESIVE for PORSCHE 911 Boxster Cayman Driver Side View Left LH Automotive Grade replacement mirror glass. Actual picture shows mirror glass on top and adhesive at the bottom. No plastic backing plate attached or included. 911 HAS TWO OPTIONS - Diagonal Measure (Longest): 7 3/4 inch = 19.7 cm . Longest diagonal dimension provided is the longest size of the glass in any direction, normally longest top to opposite bottom corners measurement Includes double-sided Automotive Grade adhesive contoured to mirror shape that provides optimum heat transfer and easy installation. Beware of small inefficient adhesive patches that fail shortly after installation, and leave air gap between bonding layers which causes uneven installation and improper heat function. Aluminum back coated real mirror glass for automotive application. Avoid cheap glasses with chrome paint spray film on top that look like mirror but top chrome spray fades or scratches over short time. Actual picture of mirror glass and the longest diagonal dimension provided to help ordering proper fit.