HEATED Mirror Glass with BACKING PLATE for Audi A3 A4 A6 RS4 S4 S6 Driver Side View Left LH Heated Mirror With Backing Plate - Clips on the motor Mount - Check picture that shows back of the glass and comare to yours 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 Check clips position and connector type in picture. Easily clips on motor, no glue needed. Complete with heat grid and not a stick on glass 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.