[whitetop]

Here is a pic from the '74 Lakewood catalog. Notice the mounting bracket and look at yours-they are 100% identical.
Why would Lakewood copy the Dana design down to the most grittiest detail and why would Dana make the bars so perfectly machined/welded(expense $$) unless they were going to mass produce them on a grand scale which we know they never did?

p.s. check out ebay # 2437270171 & 2437503631