Carefully follow all of the manufacturer's instructions with the safety seat you put in your vehicle. If you do not install and use the safety seat properly, 1998 Mustang Owners Manual Booklet. Nate's 79-93 Fox Mustang Parts. Item 3708Fits: 1998 Mustangs.1998 Ford Mustang - Owner's Manual (192 pages). Posted on 25 Sep, 2014 by Tusing. Model: 1998 Ford Mustang. File size: 2 MB. Download manual. Online Viewer. Find your Ford Owner Manual here. Print, read or download a PDF or browse an easy, online, clickable version. Access quick reference guides,