When I got this bike I found the left side cover, but not the right. Bud Provin of The Nickwackett Garage offered to supply me a new right side cover at no cost in support of my project goal to auction this bike and donate all the proceeds to the Motorcycle Relief Project.
I wasn’t able to get an ST muffler, so I installed an R80 G/S muffler from Keihan Systems in the UK. They provide an adapter kit to mount the ST heat shield on the G/S muffler.
I also had to repair the original left side cover tabs as several were broken.
Here is the link to the documentation and the summary video of how I did this work.
VIDEO: 1983 BMW R80ST Install Side Covers & Muffler Heat Shield