I had a similar problem with a post-WW2 tract house I bought in Costa Mesa. The “Kludge” done by some numbnut was still up there but the garage door opener (GDO) had been removed. It took mucho work to remove all the crap, repair necessary fastening points, and re-do it right.
Im exhausted just reading that.Time for a Nap.
We’ve got a saying here at work. “All you gotta do......” Usually it turns to crap the moment you start.