Automotive Grade replacement mirror glass. Actual picture shows mirror glass on top and adhesive at the bottom. No plastic backing plate attached or included. Diagonal Measure (Longest): 7 3/8 inch = 18.7 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. This feature is in contrast with 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. This feature is in contrast with 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. This mirror glass has Diagonal Measure (Longest): 7 3/8 inch = 18.7 cm Same year/make/model may come with different mirror shape or sizes depending on the markets they released in, options installed, or mirror may have been changed over the course of the life of the vehicle. Please compare actual picture and the longest diagonal dimension provided to your vehicle prior to order to make sure of ordering appropriate fit.