Go here to figure it out. Make sure to check your center housing casting date to verify that your axle really is a 69 housing.

http://chevellestuff.net/1969/rear_axle.htm

The shields are stone shields to protect the shocks on cars equipped with air shocks, (like yours). They are common on ElCamino rear ends, for example.

 

Thanks a lot! I really appriciate the quick answer. I belive the rear end comes from 1971 el camino or chevelle due to the casting number.

 

It's a 71 or 72 2.73:1.
KD - 2.73:1
C - Chevrolet, Buffalo plant
182 - Julian date (July 1 of 1971 or June 30 if 1972)
2 - second shift

Look for a casting date in one of the center section webs (passenger side rear if I'm not mistaken for later years) like this:

This is November 9, 1971 meaning it's for a 72 model year Chevelle. Yours should show May (E) or June (F), a date, and year number. The casting number 3969278 was used for 70-72 so that's of no real help.