I would just go buy some pipe at Menards or home depot.It is pretty common stuff. The ends of your poles should just pull out. If you bent the curved poles just bring your new pipe to a metal shop with your old ones.
Even eminent chartered accountants are known, in their capacity as fishermen, blissfully to ignore differences between seven and ten inches, half a pound and two pounds, three fish and a dozen fish. ~ William Sherwood Fox, Silken Lines and Silver Hooks, 1954