Made in USA | EZStudRack Adjustable Between Stud Shelf Bracket | Shelf Brackets for Wall Mounted Shelf | Shelving Brackets for Home | Garage Shelf Brackets- Wood Not Included- 32Pack (16 Pair) Gray

I designed something like this before and thought it was gonna be a great solution but I found it's not worth it with these available. https://www.amazon.com/EZStudRack-Shelf-Bracket-Brackets-Floating/dp/B0B8XM1L29 Now I just use my 3d printer to make custom size ones to fill in the gaps