Sorry, the ones I have ARE stainless steel. I don't think you want the aluminum ones if you actually use them for towing.
They are like the ones in this ebay auction:
http://cgi.ebay.com/ebaymotors/Hummer-H2-Stainless-Steel-Rear-Tow-Hooks-chrome-NEW_W0QQitemZ170167020071QQcmdZViewItem?hash=item1 70167020071&_trkparms=39%3A1%7C66%3A2%7C65%3A1%7C2 40%3A1318&_trksid=p3911.c0.m14
I only have the mounts and 4 bolts ( without the hooks) .Let me know if you still want them.
You can PM me.
--Jim