HANS Devices, Model 30 for Formula Cars
The Model 30 is designed for most reclined applications, including the majority of formula cars and sports racers.
To find the correct angle for your application, sit in your car and measure the angle of your chest from vertical. If the angle is 25 degrees or more, the Model 30 is probably best for you. If the angle is less than 25 degrees, you may want to try the Model 20.