The Fibertech 36 Inch Rear Quarter Fenders are designed for 52 Inch Axle Spacing and have 6 Inch Sidewalls, making them durable and resistant to starring. These fenders come pre-drilled for easy installation with no hood modifications or additional hardware required. Sold as a pair, they fit most makes and models and come with built-in polymer liners. Manufactured with 1/4 Inch thickness, these fenders require additional center support brackets, which are available in kits for Peterbilt, Kenworth, Freightliner, and Western Star. Shipping costs vary and are available upon request.