Re: One inch square tube source.
The aluminum tube on your existing bimini is most likely anodized, the tube you get from a metal supplier is most likely not anodized.
I've bought metal pieces from
these guys a couple of times. It might not be the cheapest when shipping is factored in, but it was cheaper than I could find locally. Locally, it's either very expensive /foot or you have to buy a 20' stick.