Thanks guys, I suspected as much since I couldn't find them in any catalogs.
I did find one perfect one at the junkyard, though I was surprised that it was black plated, whereas all the others I've seen are some kind of zinc plating which is awful as evidenced by mine and all the ones I see at the junkyards.
I'll just shoot mine with some rust treatment and satin black, as advised. I hate staring at those rusty parts, especially on a CA truck.