My alloy rack has legs made from 6mm flat plate with sections of round tube 30mm long welded on verticaly about 100mm from the base that sits in the gutter these tubes allow a piece of 8mm thread bar to go through them this is welded to an angle which clamps under the rain gutter under were the flat bar leg sits it clamps up with a nut and works great .
Those legs in the link wont be high enough to clear the roof of the disco maby you should look at the rhino rack legs but there not cheap either.


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