


Porsche 911 (991) GT3 Cup Steering Wheel & Hub Adapter Boss Kit For Porsche 911 (991), Cayman Boxster 718 (981)
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Porsche 911 (991) GT3 Cup steering wheel fitting kit includes a Sport Line boss kit, Porsche sticker, and fitting hardware specifically designed for Porsche 911 (991), Cayman Boxster 718 (981) models.
No additional parts are required for the successful installation of the Porsche 911 (991) GT3 Cup steering wheel.
Porsche 911 (991) GT3 Cup Steering Wheel 320mm
Porsche 911 GT3 Cup is the most successful race car in the world. Since 1998, 2,395 units of this near-standard vehicle for customer racing have been produced. The Porsche 911 GT3 Cup is the motorsport version of the 911 GT3 and is based on the seventh generation of the sports car icon from Zuffenhausen.
This steering wheel for the Porsche 991.1 and 991.2 GT3 Cup was supplied by Sabelt (P/N 991.347.804.8A), a company with a long-standing relationship with Porsche, and produced in the Sport Line factory. The only difference between the original racing-used Porsche 991.1 and 991.2 GT3 Cup steering wheels is the sticker on the back, which carries the Porsche branding and part number. All other aspects – such as size, weight and quality features like suede, anodising, gluing and engraving on the back – are identical.
Made in Italy.
Sport Line Hub Adapter (Boss Kit)
This adapter will allow you to mount your 6-bolt Sport Line or other 6x70mm pattern steering wheel to the steering column on your Porsche 911 (991), Cayman Boxster 718 (981).
It is an updated version of the official steering wheel adapter (P/N 9913479038C) that was used in the first generation 911 GT3 Cup car in Carrera Cup in 2014. This part has been produced in the same factory as the previous version.
Sport Line boss kits are handcrafted in Italy from the finest cast aluminium materials.
This steering wheel hub can absorb significant impact due to programmed deformation, significantly increasing safety in the event of a collision.
Sport Line hub adapter fitment list:
- Porsche 911 (991) (Carrera, Carrera S, Carrera GTS/S, GT3 GT3 RS, Turbo,Turbo S) (2011-2019) With Airbag
- Porsche 718 Cayman (981) (2012-2016) With Airbag
- Porsche 718 Boxster (981) (2012-2016) With Airbag
WARNING: Do not attempt to install this kit yourself unless you have been properly trained in the installation and maintenance of car steering wheels and please ensure you have previously read the instruction manual. Incorrect installation can lead to a steering wheel failure which can cause an accident resulting in serious personal injury or death.
What's Included in the Porsche 911 (991) GT3 Cup Steering Wheel Porsche Fitting Kit?
- Porsche 911 (991) GT3 Cup 320mm Steering Wheel
- Sport Line Hub Adapter
- Porsche Synthetic Resin 3D Sticker
- Fitting Kit (Bolt Kit, Retaining Ring)
Please note that the images are for representation purposes only and might not reflect the exact part selected.
Brand | Sport Line |
Country Of Origin | Italy |
- Porsche 911 (991) GT3 Cup Steering Wheel
- Sport Line Hub Adapter
- Porsche Synthetic Resin 3D Sticker
- Fitting Kit (Bolt Kit, Retaining Ring)

The company was founded in 1955 as a mechanical outfit manufacturer, and in 1963, it began working in the steering wheel line on behalf of a third party, collaborating with car manufacturers and other companies in the field. Meanwhile, the company's expertise in steering wheel processing continues to grow.
Since 1982, the company has been developing its own steering wheel line, introducing the new trademark Sport Line to the market.
Soon, the manufacturing know-how, the most recent design, and the exclusive use of first-rate materials enable Sport Line to meet with acclaim in the national and international markets.
The company has broad and consolidated experience in metal shearing, injection, bending, and welding, and has been designing and building molds and molding plastic parts for third parties since 2004.
Officine Rossi Marco (Sport Line) is an ISO 9001 certified company.