Print legibly in blue or black ink ONLY, within the lines provided. Vehicle Specific Authorization Letter.Please complete this printable form online or write legibly in blue or black ink ONLY, within the lines provided. What details do I need to fill out in the form? You need to provide client's name, supporter's details, type of support, and signatures. Filers Information: Name, email address and signature must be included on the document. Draw your signature, type it, upload its image, or use your mobile device as a signature pad.