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Here's a link to a shot of my set-up: http://redfalken.com/pages/brakes.html

So doesn't the "non self-adjusting" that's on there now have that bar and spring? I thought the self-adjusters were...

You might try an older brake shop. If they know they're not available they might stock some salvaged ones. I've been to Aurora Brake a few times to get some misc. brake parts.