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.
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Starlink Mini: Magnetic Car Mount & Mounting Kit with PC Protective Plate Fits Car/RV/Roof Rack/Vehicle with Handle
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.
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16W Car Roof Star Atmosphere Light with RGB Music APP Control Fiber Optic Kit for Starry Sky ceiling 8 Colors Car Styling DIY
Aliexpress UK
The FREAK FIT mini floor to ceiling balls are designed by myself a pro boxing coach to help improve speed, accuracy and timing for Pro, Amateur & Novice fighters. fixings to attach bungee to floor and ceiling now included FREE.
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10-100pcs Auto Headliner Repair Fasteners Snap Rivets Universal Car Roof Retainer Pin Fabric Buckle Interior Ceiling Fixing Kit
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.
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60Pcs Roof Tiles Building Set Miniature Tiles Mini Dollhouse Shingles Fake Tile Dollhouse Kitchen Garden Accessories
Aliexpress UK
Fit for roof box of most cars, van, cargo carriers. (luggage racks up to 80mm thick). Suitable for roof racks up to 80mm in width. Not compatible with Thule car racks. 1,Put the roof box in the center of the roof and open the lid.
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Car Hood Bonnet Roof Trunk Kit Stickers For VW Volkswagen Polo 6R 6C 9N2 9J GTI PVC Racing Style Decals Auto Tuning Accessories
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as new condition, poor packaging
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Starlight Headliner Kit Twinkle 500pcsx0.75mmx3m Fiber Optic Lights Star Lights for Car Car Home Star Ceiling Sky Roof Use
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
Starlight Headliner Kit Twinkle 500pcsx0.75mmx3m Fiber Optic Lights Star Lights Car Home Star Ceiling Sky Roof Use Decorative
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.
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30-60POCS Universal Car Roof Fixing Buckle Screw Kit Fastener Auto Interior Ceiling Cloth Shedding Repair Rivet Cars Accessories
Aliexpress UK