I have a set and would like to repo them cant be any harder than making a fiberglass speaker enclosure.
Whats needed.
Tin foil- lay it on the bumper so the foam doesn't stick to the bumper once its removed its like nothing ever happened.
Sprayfoam- used to rough the shape out.
Fiberglass- obviously what its made with lay it around the spray foam once its shaped.
Filler- Used to perfect the shape and fitment.
Sandpaper
Primer
Paint
Done!
Seriously these would not be hard to make at all.