Thank you for bringing this to our attention. We're sorry that your package had missing parts. Clopay makes every effort to ensure our doors are shipped with all necessary parts. I am glad you were able to obtain the parts and get the door installed. The rear mounting brackets is not supplied with a garage door as the brackets only need to be replaced or installed on new construction or are need of replacement. Please know when missing parts, our installation manual provides our Clopay Consumer Services Dept telephone number, 800-225-6729 so we have the opportunity to rectify this issue and send you the necessary parts immediately. Thank you, The Clopay Team.