Autotecknic Replacement Mirror Covers BMW Z4 G29 (18 21) [M Inspired] AutoTecknic M Inspired Carbon Fiber Mirror Covers G01 X3 G02 X4 BMW G29 Z4 M40i 30i M Style Carbon Fiber Mirror Caps 2018+ Eurspec Dry Carbon Fiber Replacement Mirror Cover M Style For BMW F40. Product Description AutoTecknic Replacement Aero Carbon Mirror Covers for the G29 Z4. All AutoTecknic mirror caps are made according to their OEM counterpart to ensure a 100% fit. Our products undergo rigorous tests and quality control before being released to the public. The package includes one pair of passenger and driver side direct OEM replacement aero mirror covers. Available for order through our website or direct with AutoTecknic authorized retail sales. Optional: Upgrade to Version II Pre Preg Dry Carbon Fiber VersionDry carbon fiber's name comes from its manufacturing process. Dry carbon fiber is formed using a "pre preg" or impregnated piece of carbon materials. This piece of carbon is first placed into a mold and then into a sealed vacuum (autoclave) to properly cure. This method creates the least amount of waste and forms a lighter version of carbon than the wet method. The autoclave vacuuming process of making dry carbon means fewer pinholes and virtually no air pockets in the carbon. Dry carbon is the highest quality version of carbon fiber products that are produced.