Well it looks like someone sat on my Tiller Crossbar while watching the sun set and snapped it in half.
Does anyone know where I can get an aluminum rod matching the exact dimensions of the original? Don't need the hardware only the aluminum pipe. It's approx. 73 3/4" long x 1" Diameter and .120 Thickness. Thank you. 
Online metals has a wide range of tubing (lots of other stuff, as well). Their prices aren't bad, either, but shipping may be enough to call around for a local supplier.
https://www.onlinemetals.com/merchant.cfm?id=71&step=2&top_cat=60
It will be easier to find 1/8th-wall 1-inch tubing, and you also might look for a sleeve that you can rivet in. There's not a lot of load on the tiller crossbar unless someone uses it as a stool (frustrating, that!).
Randii
3/4" schedule 40 aluminum pipe has an od of 1.050. It sleeves right into 1" schedule 40. I bought a 20'-0" stick at my local metal supplier for about $35, and a 1'-0" piece from Online Metals
I made a tiller crossbar with material to spare.
I'm building a new crossbar myself. I'm using 1" 6061 aluminum that cost me $15 locally. I'm putting 7/8" delrin at the center and ends to strengthen where it will be drilled through. I've learned the hard way that 7/8" isn't always 7/8".
Where are you at? That might help others identify good sources of material for you.
Pipe and Tube are sized complementarily just for nesting.