LR3 Rails

i’m building an LR3 in the us. My question happens to be simple, is the Y rail a different size from the X beam size as far as EMT it call for 3/4 EMT for X beam but the Y rail states 1/2 EMT or is it all the same size?

I prefer the way I listed it 3/4" X and 1/2" Y, but you can do 3/4" Y if you want.

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