Spare tire and Jack info

Does anyone have any pictures or information on the correct jack and how it and the spare tire is mounted in the trunk? I found a couple of pictures of the tire location, but nothing on the jack assembly or how that's mounted.

This is what I currently have minus the spare tire. Not sure why I have 2 wing nuts either. Car is an '89 Diplomat ex cop car. Thanks

View attachment 31184
Author: sublime440