I checked with Thule for your 2023 Volvo XC40 with flush rails, you will want the 53" WingBar Evo Crossbars item # TH711420. This crossbar is 6" longer than the 47" WingBar Evo item # TH711220 that is recommended for your Volvo. You'll have just enough room to transport two 29" wide kayaks horizontally using the Thule DockGlide Kayak Carrier item # TH896.
Here are the rest of the parts you will need to attach the crossbars to the flush rails on your roof:
Evo Flush Rail Feet for Thule... view full answer...
To add a custom fit wiring harness to your 2021 Volvo XC40 you will want the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118792. This custom-fit T-One connector plugs into your Volvo's wiring harness, which is located in your rear cargo area, behind the tail lights. view full answer...
The Thule Hullavator item # TH898 requires somewhere between 4" - 8" of additional overhang past a roof racks mounting legs for the lift assist function to work properly without damaging the side of your Volvo. With this in mind, I recommend the roof rack by Thule for your 2020 Volvo XC40 and it includes the following parts:
Thule WingBar Evo Crossbars - Aluminum - Black 60" Long - Qty 2 item # TH711520 or Silver item # TH711500
Evo Flush Rail Feet for Thule Crossbars - Flush Side Rails... view full answer...
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