As a design engineer for Anderson, I can tell you there are a couple ways to buy our connectors. The first is our online store, at
http://store.andersonpower.com/. You can also find a local distributor by clicking your region
on this map.
The standard FRC battery connector is what we call the "SB 50", which is our smallest multi-pole connector. Our part number 6331G2W (which says is for #10 contacts) will also accept a #12 wire.
If you're looking for something smaller, the Powerpole line (which I think may be what you were asking about?) has 30 and 45 amp varieties, both of which can be ordered with a #12 contact.
If you want more information, we have
catalogs and datasheets available to browse. Hope this helps!