VEVOR Van Roof Ladder Rack, 3 Bars, 661 LBS Capacity, Heavy Duty 34.6"-56.7" Adjustable Steel Roof Rack Cross Bar, Fit Vans with Rain Gutters, for Kayak Canoe Lumber Pipe Cargo, White

Shelves are telescopic and adjustable, the specific width is based on the car body. How wide the car body, how wide the shelf is installed after completion.