Simply cut bungee to the length you need

Superstrong, flexible bulk bungee cord stretches safely up to twice its original length without cracking, breaking, splitting or becoming brittle. High-tech, ultralight polyurethane resists UV rays, oil, salt water, gasoline/diesel fuel and most household chemicals. Bungee works great in the cold or heat and humidity. 50'L. High-strength plastic hooks (sold separately) for 1/4"-dia bungee (Item # ) or 5/16"-dia. bungee (Item # ) won’t mar your load or vehicle.