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The Thule Squarebar Package for Truck Topper Canopy is a great custom installation option for vehicles with fiberglass roof surfaces, such as Truck toppers, canopies and hard shell bed covers. The Thule track system allows for custom spacing of your crossbars and easy removal when not in use.
You will need to match the distance between the left and right Top Tracks with the spacing range on the crossbar. This is measured from center to center on each track. Estimate your width by determining where you would like the tracks to sit on your vehicles roof line. Ensure the Tracks will lay flat on the surface and you will also have a flat surface on the underside where washers will sit. Use the chart below to match the appropriate crossbar length to the lateral track spacing:
| Track Spacing | Crossbar Length | WingBar Evo | SquareBar Evo |
| 30in - 42in | 43in / 108cm | 108cm (43") | 108cm (43") |
| 34in - 46in | 47in / 118cm | 118cm (47") | 118cm (47") |
| 37in - 49in | 50in / 127cm | 127cm (50") | 127cm (50") |
| 39in - 52in | 53in / 135cm | 135cm (53") | 135cm (53") |
| 47in - 59in | 60in / 150cm | 150cm (60") | 150cm (60") |
**See Thule Top Tracks with Bolts Instructions for more information**
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