Here are some in brass, which might be okay:
You might also check with Rostand in Utah at 801-280-2400.
Or MArine Fastener Wharehouse at http://store01.prostores.com/servlet...use/StoreFront
I will try to think of others. But in the interim you could just use standard s/b hex nuts until you come across the acorns. I'm sure you have plenty of other projects....