That drawing has a mistake. The heat shields attach to the brackets on the car body at the top and bottom. That shows them attaching to the exhaust at the top.
Looking at the diagram of the brackets attached to the body, that does make more sense.
kirkusblog.com 2016 M3W John A Prestwich Special 1952 Ford 8N 1968 Honda CL175,and 2018 Ural Retro