According to Curt, Trailer Hitch, # 11730, is designed to fit the hatchback and convertible models of the 1997 Saab 900. This hitch comes with the compatible ball mount, hitch pin and clip. For a ball, you can use # 19256 (1-7/8 inch diameter) or # 19258 (2 inch diameter). For trailer wiring, use Tekonsha # 118650. I have included a link to the installation details and a link to a video showing a typical installation. view full answer...