Pulpit is on the bow, it's called a pushpit on the stern.
Defender, West Marine and other online suppliers sell the tubing and the fittings. I wouldn't bother with bending, if it was just to hold up a solar array.
I’ve had decent luck ordering Bimini parts from Wholesale Marine online. For tubing try the local canvas shops - they usually have some or will know of a source.I want to add a small arch above my stern pulpit - to place solar panel - my boat is a double ender so a bit pinched in the stern but already has a beefy pulpit - where can one buy the tubes and assorted attachments?