Porsche Aerokit II Side Skirt Part Number: The Complete Guide

If you're searching for the Porsche Aerokit II side skirt part number, you're likely restoring a 997 or 987 model, upgrading its appearance, or replacing a damaged piece. The Aerokit II is one of Porsche's most iconic factory aero packages, giving the 911 and Cayman/Boxster a more aggressive look while improving high-speed stability. Getting the correct side skirt part number is essential for a perfect fit, maintaining genuine appearance, and ensuring proper sealing and mounting. This guide provides the exact OEM part numbers, explains variations between left and right sides, and offers practical advice for sourcing authentic parts.

Understanding the Porsche Aerokit II and Its Side Skirts

What is the Aerokit II?

Porsche introduced the Aerokit II as a factory option on the 997-generation 911 (2005–2012) and the 987-generation Boxster/Cayman (2005–2012). It includes a front bumper with larger air intakes, side skirts, a rear diffuser, and a fixed rear spoiler. The side skirts are the long, sculpted panels mounted between the front and rear wheel arches, designed to channel airflow along the car's flanks and visually lower the car's stance.

Role of Side Skirts in the Aerokit II

The side skirts aren't just cosmetic. They reduce air turbulence under the car, help cool the brakes by directing air, and blend the front bumper into the rear diffuser for a cohesive aero package. Genuine Porsche parts are built from impact-resistant polyurethane (PUR) to withstand road debris and minor impacts without cracking. The mounting system uses factory slots and clips, ensuring a gap-free fit that lasts.

The Exact Part Number for the Porsche Aerokit II Side Skirt

Factory Part Number for 997 and 987 Models

The side skirts come as a left and right pair. For the 997 Carrera and 987 Boxster/Cayman with Aerokit II, the OEM right side skirt (passenger side in US) part number is 997.505.477.00. The left side skirt (driver side) is 997.505.476.00. These numbers apply to both the 997.1 (2005–2008) and 997.2 (2009–2012) models, as well as the 987.1 and 987.2 variants. However, always verify with your VIN because some special editions may have slightly different parts.

Variations: Left vs Right, With or Without Side Intakes

The left and right sides are mirror images and not interchangeable. The part numbers above are for standard Aerokit II side skirts without additional side intakes. If your car has the optional side air intake fins (sometimes called "side strakes"), the side skirts themselves are the same—the fins are separate add-on parts. For the 997 Turbo with Aerokit II, the side skirts may differ due to wider rear fenders. The Turbo-specific left side skirt is 997.505.485.00 and right is 997.505.486.00. Always confirm with your model's parts catalog.

Compatibility with Different Model Years and Options

The Aerokit II side skirts fit both the narrow body and wide body 997 chassis, but the wide body (Carrera 4S, Turbo, GT3) requires the proper part number. For the 987, the skirts are the same for Boxster and Cayman, but the 987.2 (2009–2012) uses the same part numbers as the earlier cars. Porsche often supersedes part numbers, so check for the latest revision. For instance, 997.505.477.00 may have been replaced by 997.505.477.01. A dealer or online OEM parts lookup with your VIN will give you the exact current number.

Where to Source Genuine Porsche Aerokit II Side Skirts

Authorized Porsche Dealers

The most reliable source is a Porsche dealership's parts department. They can look up your VIN and order the correct side skirt, often within a few days. Genuine parts have a factory paint-ready primer finish, though you may need to paint them to match your car. Dealership prices are highest, but you get warranty and guaranteed fit.

Reputable Online OEM Parts Retailers

Several independent online retailers specialize in OEM Porsche parts. They often offer lower prices than dealers and ship directly to you. Look for businesses that include the factory part number in their listings and explain that parts are genuine. Avoid generic "OE replacement" terms—the part is uniquely Porsche. Use the manufacturer's part number and confirm it's a factory-sealed item.

How to Verify Genuine Parts Using the Part Number

Counterfeit side skirts exist. Genuine Porsche parts have a part number molded into the back, along with a date code and the Porsche crest. The plastic is flexible, not brittle. When you receive the skirt, compare the part number on the physical part with the number you ordered. If the sticker looks tampered with or the part has rough edges, it's likely a fake. Only buy from trusted sellers with return policies.

Aftermarket Alternatives and What to Watch Out For

Quality and Fitment Differences

There are aftermarket replicas of the Aerokit II side skirts, often made of fiberglass or lower-grade plastic. Fiberglass can crack easily and doesn't flex like the OEM PUR. Fitment issues are common—gaps at the fender edges, misaligned mounting points, and sagging over time. If you're looking for a budget option, accept that the look may be close but the durability and fit will not match factory spec.

Avoiding Counterfeit or Low-Quality Copies

Some sellers list parts as "genuine" but supply aftermarket pieces in unbranded boxes. To avoid this, request photo of the part number label before shipping. If the price seems too good—say, less than half of dealer cost—it's not OEM. Genuine left and right side skirts for the 997 typically cost between $500–$800 each new, unpainted. Expect to pay $200–$400 for painting and installation.

Final Recommendation

For a perfect fit and long-lasting durability, always choose genuine Porsche OEM side skirts for the Aerokit II. The correct left side part number is 997.505.476.00 and the right side is 997.505.477.00 for standard narrow-body 997/987 models. If you own a 997 Turbo, use 997.505.485.00 (left) and 997.505.486.00 (right). Before ordering, confirm with your local Porsche dealer or an online parts lookup using your VIN. Genuine parts are an investment, but they ensure your Aerokit II looks factory fresh and functions as intended. If budget is an issue, consider a used OEM pair in good condition rather than new aftermarket replicas. The small savings you get from aftermarket will be offset by fitment headaches and premature wear.