Aluminum track/profiles source in Europe?

I have seem some are not using the tracks/aluminum parts from farmbot:

I’m a bit confused about the correct size:

If I download the step model and import in into FreeCad I get a profile of 15x15mm but if i’m looking at the v - wheels docs it says you need a v slot profile of 20x20mm.

I seems that 15x15mm v slot it not so common. Is there a better list to source the alu parts in Europe?

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