I got 2 sets from IUnkwon or something like that, from this forum or The Planted Tank forum. They are not ADA pipes, But for less than half the price I'm happy. I did break one of the inlets pipes trying to gently
force it on my 75G tank. The rim was to big for the pipe. I did have to cut a small slit on the plastic rim to fit the the other inlet. I really like the outlet pipe it creates a wondefull flow without being over powering. but the inlet pipe I don't much care for, other than looks IMO it's not so good. But they do look good toghether.
I wonder if there is a glass blower in Tampa or Orlando that will be willing to make the pipes for a reasonable price. I would love to have them on all my tanks of different sizes.