#20x20 Aluminium Extrusion
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The configurator has the lengths in there. It says things like "Misumi HFSB5-2020-420", which means 420mm.
The suffixes (LCP, RCP, TPW, whatever else it might say) I think are for factory-drilled holes for blind joints or threaded center holes, but you'll obviously have to do that yourself.
Also want to point out that the sourcing guide is not the bill of materials. The qty is a lie.
Get the bom, and that will be accurate.