Coupe Side Vent Architecture and Framing
Replacing the stationary rear vent glass on the R8 requires understanding how tightly this panel is tied into the mid-engine bodywork. While the frameless doors feature a single piece of drop glass, the rear side quarter area uses a permanently fixed triangular glass assembly that transitions the passenger cabin into the engine bay cooling areas. On Coupe models, this glass anchors directly adjacent to the iconic exterior side blades and the aluminum B-pillar post, sitting immediately below the sweeping roof rail structure.
Because the Type 42 features the aluminum Audi Space Frame, the glass serves an acoustic and aerodynamic role rather than a mechanical venting function. It does not tilt, slide, or vent outwards. The panel itself is a solar-control tempered unit with a factory green tint, bordered by a wide exterior black ceramic frit band designed to shield the bonding track from sunlight. Unlike the vertical glass partitions or hatch screens on this car, the side vent panels carry no embedded defroster grids, antenna lines, or ambient sensors. The entire assembly sits flush against the body line to ensure the frameless door glass—which indexes downward slightly whenever the door handle is pulled—seals cleanly against the shared B-pillar weatherstripping.
Part Identification and Surrounding Hardware
Identifying the correct panel depends on vehicle configuration, as the R8 Spyder eliminates these side vent apertures entirely in favor of buttress vents and an independent vertical rear window. For the coupe, catalog numbers and body trim references include specific hardware:
- Left Side Quarter / Vent Glass: OEM reference 420845299 (superseded by 420845299NVB)
- Right Side Quarter / Vent Glass: OEM reference 420845300 (superseded by 420845300NVB)
- Associated Fasteners: Retaining strip rivets under part number N91019701 and specific factory alignment spacers
- Interior Access Panels: Cabin trim components from the 420867 series that line the rear cabin wall
When working on these cars, I back the replacement glass with a one-year defect guarantee while standing behind my own installation workmanship for the lifetime of your vehicle. The carbon fiber or smooth aluminum side blades sit fractions of a millimeter from the glass perimeter, leaving zero room for panel misalignment. The glass depth must match the original factory stand-off precisely, or wind noise will develop along the trailing edge of the frameless door window seal.
Does the vent glass open on the Audi R8 Coupe?
No. The side quarter vent glass is completely stationary and bonded to the frame. It does not open manually or via power motors, functioning solely as a fixed viewing port and aerodynamic surface.
Is this glass found on the R8 Spyder?
The Spyder convertible does not use these rear side quarter vent glasses. Its rear bodywork relies on solid engine cover buttresses and a motorized, vertically dropping glass pane positioned directly behind the seats.
What features are integrated into the rear quarter glass?
The glass features a factory green solar tint and a structural perimeter frit band. It does not contain radio antennas, heating elements, or any electronic sensors.
