Gave up trying to find a genuine Colt Commander hammer...
At least in stainless, so I ordered a C&S Tactical II hammer. It's stainless bar stock, hardened and very nicely contoured with all the edges nicely chamfered. For now I have a Wilson drop in beavertail grip safety on the way. I figure I can always instal a fitted GS later if I choose. I have the hammer, just waiting for my grip safety. After that, I just need to figure out what's up with the sights. The rear sight is a bit too far to the left for my satisfaction. It's a standard 1991 type sight and to hit center at 25 yards it has a bit of dovetail flat showing on the right and overhangs the dovetail a bit on the left by about 1/32-1/16". There isn't a flat piece on that sight to measure but I personal think the sight isn't perfectly symmetrical. Once I get the the hammer/GS done, I may drift it out and install it backwards. If the situation reverses I'll know it's the sight and find a different rear sight. If it doesn't I'm not sure what I'll do but it definitely bothers the heck out of me to not have that sight centered in the dovetail.