WHAT IS THE CORRECT AIR FILTER STYLE FOR A 69 Z28 WITH OPEN AIR CLEANER
Delco A212 CW, is the filter. There are different versions, from the new Delco ones made in Mexico, to the original style ones from the late 60's and 70's, and even those have different fonts and lettering versions. Brand new they will all do the same job. If your going to drive the car just get the cheaper priced equivalent from your auto parts store, save the original style for shows.
Ground UP sells reproduction A212CW filters that have the diagonal metal mesh and the slight off-white paper plus white edge lettering. Their P/N is N-1012 and the price (last year) was $32.95
Mike
As there are a few versions of the A212 CW, a read through of this thread might help:
http://www.camaros.org/forum/index.php?topic=9392.msg70204#msg70204