Mclaren 765lt Rear bumper flaps rear skirt spoiler L and R

McLaren 765LT, the components you are referring to are high-performance aerodynamic parts designed for the “Longtail” (LT) profile.

Depending on exactly which part of the rear assembly you are looking for, these are most commonly known as the Rear Bumper Side Blades (Winglets) or the Rear Skirt/Lower Bumper extensions.

Component Identification

On the 765LT, the rear bumper is significantly more complex than the 720S to manage the massive increase in downforce. The “flaps” or “skirts” you are describing usually fall into these two categories:

1. Rear Bumper Side Blades (Aero Winglets)

These are the vertical carbon fiber fins located at the far outer edges of the rear bumper, behind the rear wheels.

• Function: They manage air “wash” coming off the rear tires and smooth the transition into the low-pressure zone behind the car.

• Material: Almost exclusively Gloss Visual Carbon Fiber.

• OEM Part Numbers (Approximate): * Left (L): 14NA696MPCFG (Spider variant often listed)

  • Right (R): 14NA697MPCFG (Spider variant often listed)

2. Rear Skirt / Lower Bumper Extensions

These are the horizontal sections that run along the bottom of the rear bumper and connect to the massive rear diffuser.

• Function: These extend the “Longtail” effect, effectively lengthening the floor of the car to pull more air through the diffuser.

• Replacement Cost: Genuine McLaren OEM carbon fiber units for these sections typically retail between $6,000 and $9,000 for a pair.

Replacement & Upgrades

If you are looking to purchase these, there are two main routes:

• Genuine OEM (McLaren Special Operations): Best for maintaining the value of an actual 765LT. You can source these through specialized vendors like Miller Motorcars or Apex Spares.

• Aftermarket (720S to 765LT Conversion): Many owners of the 720S buy “765LT Style” rear skirts and bumper flaps. Companies like DMC, RSC Tuning, and Aero Republic produce high-quality dry carbon fiber versions that mimic the LT look for a fraction of the OEM price

Important Note on “Dynamic Flaps”

If you have a 765LT Spider, there are also “Dynamic Flaps” located on the tonneau buttresses (the area behind the seats). These are controlled by electric motors and deploy when the roof is open to manage cabin wind turbulence. These are often confused with bumper flaps in parts catalogs.