Spotting headlights BLC to others, what's the diff?

Ok, I really like the headlights with indicator lights on top. I am amazed at the prices the BLC's are fetching. What is the significance of these lights? Is it just hype that has inflated their price?
My next question is, Did they come stock on any vehicles? I have seen similar lights on some 30's utility vehicles, and what I believe is a dodge sedan delivery.
Also, I would imagine the price on the E&J's is due to their rarity. I've heard they use to be an item on the Jordan Playboy. Would anyone have a pic of this vehicle? I've always wondered what one looked like.

 

The B-L-C`s along with the Guides were to the best of my knowledge aftermarket items and not offered as standard equipment. I have heard though, that the Guides were often found on semi trucks such as Reo`s but not sure if these had the Guide tags behind the markers. The Guide 682C`s are fairly common and much easier to find then their B-L-C counterparts, 904A`s. Also, the Guides buckets were indented for the marker housing and they are different then the ones without the markers.The markers seem to be a desired item as it fills the signal light dilema. Just my 2 cents. HB32

 

This will probably get moved to the main board...

I've been trying to figure this headlight thing out too.......

http://www.jalopyjournal.com/forum/showthread.php?t=57246

 

"The Guide 682C`s are fairly common and much easier to find then their B-L-C counterparts, 904A`s."Huhhh????

I have a pair of headlights with the tags behind the marker lights and they tags are clearly marked "BLC 682C" - no mention of Guide on the tag.........