HOLY MOLY BATMAN IT'S TRUE~~~
Bills Truck Shop out of Canada
http://www.billstruckshop.com/
Click on New parts, menu drops down, select 60-66, then scroll down.
http://www.billstruckshop.com/60-66.html
Try not to break your key board rushing to buy these.
I got this from a member of the 67-72 Chevy / GMC site