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Recon makes some low profile ones See here for comparison: http://forum.73-87chevytrucks.com/smforum/index.php?topic=7921.msg50309#msg50309
OEM lens you say? GM P/N 684662 (old part number maybe discontinued).However all is not lost.......Truck-Lite 9069A is the actual GM OEM lens available through the aftermarket.Truck-Lite 1313A is the actual GM OEM lens, and rubber base also available through non-GM sources.I have several nos rubber bases in the GM bags that I am holding onto in case the brand new ones I just put on my '77 ever dry out. I also have brand new lenses (bought while GM still had them) that aren't all frosty.
Zieg, I added cab lights to my C20 that didn't originally have them. I have all of the factory measurements if you would like them. They are actually measurements on top of a pic of a roof so you can see EXACTLY where to place them.As for sourcing a wiring harness, I know Chris doesn't have them unfortunately, but one of the major resto parts suppliers ending in "truck" has them, $14.95.
http://www.truck-lite.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&productId=28601
here some led ones with the wireshttp://www.ebay.com/itm/Set-5-Cab-clearance-1313A-Amber-Light-10-5730-SMD-194-bright-Amber-LED-for-Chevy-/181660029304?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2047675.l2557&nma=true&si=YbB%252FNqfC0trpiKars%252BogUA8BpO8%253D&orig_cvip=true&rt=nc