Front sway bar reinforcement: help?

I'd like to make a front sway bar reinforcement. You know the piece that triangulates the mount to the crossmember?

Anyways, i'm figuring all the pre-made ones won't work because our crossmembers are dropped 1/2".

So i was looking at materials on McMaster-Carr. I thought stainless would be nice because it won't rust, but then i'm not sure on how it would fatigue (aren't stainless steels more likely to fatigue?). Or i could go steel, or maybe there's a good aluminum alloy to use?
And how thick? I figured 1/8" would be enough?

Just looking for any input before i spend the bucks to get some materials.

http://www.azom.com/details.asp?articleid=960 < Click This
301 / 304 / 316 Stainless

I had been looking at 301, so you think that's a good choice? It looks like about $40 for 60" of it.