We only test and certify the shortest bar length required to span the vehicle and still provide enough overhang to accommodate the Load Bar End Caps. However, it is sometimes possible to install longer bars if you would like more mounting area.
Any length SquareBar can be mounted to a vehicle as long as the ends of the bar do not extend past the side view mirrors.
Due to the built in channel under the AeroBlades, upsizing is not always possible. You will need to take a few measurements of the roof and attachment points to ensure proper fit. Please reach out to Thule Customer Service via our help line at 1-800-238-2388 (M-F 8:30am to 5:30pm, Eastern Time), and we will be able assist you directly.