Aeronautical Accessories offers a branded line of windows for Bell 407 helicopters. All Replacement Windows and Special Use Windows are fabricated using state-of-the-art manufacturing processes, from high-quality acrylic and are FAA/STC approved. Additional Notes: Two different sets of Aeronautical Accessories Brand Windshield configurations exist. The first configuration is the L/H Windshield (407-546-121) and the R/H Windshield (407-546-122), and the second configuration is the "Net Trim" L/H Windshield (407-546-521) and the R/H Windshield (407-546-522). Each configuration is a matched set part number and each configuration is interchangeable. (These configurations are also available in Solar Advantage. https://www.aero-access.com/products/Bell-407%2540c-Solar-Advantage-Windshields.html).