"Blue Dots" are just as the name implies.. a blue 'dot' in the center of the tail light lens.
From what i've read, at least where the 40's thru 60's chevrolet trucks are concerned, they were never a factory option.. they were something people got to 'dress up' or 'customise' their rides.
A 'peep mirror' is just a little round side view mirror.
Closest thing i've got to a 'peep' mirror is the factory Option 210 mirror on my '46 2 ton drivers door.
Here\'s a link to an eBay auction for some BlueDot tail light lenses
