I'm having a little trouble finding what I need.
Pretty sure clamp size is 21mm.
I want low rise bars that are at least 600mm

I have a trek 7300 from 2003... what I'm trying to accomplish is: I have broad shoulders. I want to throw on bar ends and lower the handlebars a bit. I have ergon grips right now, but if I move them closer to accommodate bar ends, they will be too close.

If I can find bars for the clamp size, then they are too narrow.
Wide enough bars clamp size is 30(?)mm.

I'm looking to do this on the cheap, and would prefer chromoly over carbon. Would prefer silver/shiny.

Are you sure your stem's clamp size is 21mm and not 25.4mm?

Here are some but not CrMo or silver/shiny. They are the correct width though.

https://bbbcycling.com/bike-parts/handlebars/BHB-05/

My wife has a polished alloy riserbar by Grunge. They make 650mm wide but I don't know if they are sold in the States.

25.4 is probably right.

I went through a hunt for 25.4 clamp bars a few weeks ago.

I wasn't looking for chromoly or silver, so I've probably missed seeing some, but I remembered seeing this Surly chromoly flat bar that's wide enough that you could cut it down if you needed to and if no rise isn't too low rise(guess it depends on what you consider "on the cheap" but it's $46 from the place at the link: https://www.treefortbikes.com/product...rsion-Bar.html).

This one is aluminum, but it's really cheap and fairly low rise and sneaks in at the 600mm minimum width you said you wanted. Says not intended for downhill use--I assume it's talking about that category of mountain biking and would probably be fine for the way most people ride a hybrid. https://www.niagaracycle.com/product_...da49292a74028c


Keep in mind that going to a wider bar effectively increases your reach and going to a lower rise increases your reach.