Brush rest since the early 70’s. I made a strike plate from thin leather to cover that area of the window. I cut a hole to fit the rest. So, rest was surrounded by leather. These days I would use Velcro. Also Velcro on the shelf. Yes, I tried other rests, namely flipper type. Some can be a pain especially if you catch the wire on a branch. Another rest that’s popular Is the Bear Weather Rest. Lots of folks like them. Either one isn’t that expensive , I carry a spare although I only had one fail ever.