Aluminum Square Wall

Telescoping tubing?...?
Where can I get Aluminum telescoping tubing in the US?
It needs to be square 2.5 x 2.5 In. with a .125 In. wall,
2.25 x 2.25 in x .125 wall,
and 2 x 2in x.125 wall
And each section needs to be about 8’ long.
Any suppliers?
Thanks in advance.
Look up in the yellow pages "Steel warehouse suppliers."
They also carry aluminum tubing.
In the central states the 2 that I know of is Central Steel and wire. And J.T.Ryerson.
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