Yes, a roof box needs to be affixed to a set of roof bars to hold it securely in place. Even cars with factory fitted longitudinal roof rails will still need a set of roof bars that go from rail to rail in order to mount a roof box.
eBay
4Pcs Car Roof Rail Rack Moulding Plastic Garnish Clip Covers Black Roof Caps Replacement Accessories for Mazda 2 3 6 CX5 CX7 CX9
Aliexpress UK
Roof Bars and Box Bundle This is the best way of being sure the box will be compatible with the bars. We have tested it for you! You can also save money buying them together in just one order. Roof Bars Technical Specifications.
eBay
Flat Roof Portable Glass Sunroom Glass House Polygonal Roof Sunroom
Aliexpress UK
Roof Bars and Box Bundle This is the best way of being sure the box will be compatible with the bars. We have tested it for you! You can also save money buying them together in just one order. Roof Bars Technical Specifications.
eBay
Car Door Step Foldable Universal Fit Door Hook Step StandPedal for Car Roof Access, Roof Rack Foot Step Rooftop Doorstep Car SUV
Aliexpress UK
The La Prealpina bars have a very clever design which simply works! The foot kits are designed to fit each vehicle and follow the contours of the vehicle's bodywork. They are manufactured from steel and finished with an anti-corrosion thermo-setting powder coating.
eBay
Car 10 CM Length Antenna Roof Antenna Radio Adapter for Smart Fortwo 451 450 FM/AM M6 Rod Antenna Roof Antenna Radio Antenna
Aliexpress UK
For Skoda Roomster 2006-2013. for Skoda Fabia 2007-2013. for Skoda Octavia (Mk2) 2004-2013. The storage case is foldable, showing your glasses conveniently. 1x Car glasses Holder. Good cover is dust-proof, which provides protection for your glasses or jewelries.
eBay
12V Car Starry Sky Roof Modified Fiber Optic Car Roof App Control Starry Sky Panoramic Skylight Branch Flow Starlight Source Mac
Aliexpress UK
Roof Bars and Box Bundle. This is the best way of being sure the box will be compatible with the bars. We have tested it for you! You can also save money buying them together in just one order. The Junior Easy 420 Litre Roof Box is a sturdy and convenient way to add additional storage space your vehicle. The Junior Easy 420 is made from UV protected Polystyrene and comes in two easy to assemble pieces, this two part box allows us to reduce packaging making the Junior Easy 420 Litre Roof Box better for the environment. Assembly on this roof box takes just seconds requiring two pins to be inserted to fix the hinges.
eBay
【Roof Crack Waterproof Coating】Leak Repair Sealant - High-Elasticity Waterproof Paint for Roof Cracks Long-Lasting Protection
Aliexpress UK
Roof Bars and Box Bundle This is the best way of being sure the box will be compatible with the bars. We have tested it for you! You can also save money buying them together in just one order. Roof Bars Technical Specifications.
eBay
AM/FM Aerial Antenna Roof Base Fit For Volkswagen Golf Jetta Bora Passat Gti Sharan Lupo Roof Antenna Car Accessories
Aliexpress UK
Roof Bars and Box Bundle This is the best way of being sure the box will be compatible with the bars. We have tested it for you! You can also save money buying them together in just one order. Roof Bars Technical Specifications.
eBay
Ladder Roof Rack Clamps with Padlock Ladder Locks Safe Roof Hook for Ladder Mounting Accessories Heavy Duty Lockable for Car
Aliexpress UK