[RicksGTO]

I was able to replace the one on my '72 without removing the knobs, but I believe with the earlier ones the knobs won't clear the slots in the glass. I painted the black background with a semi-flat black once I got the old lens out. Here is a good article from Hemmings that should help with a '69 :
http://www.hemmings.com/mus/stories/...hmn_tips2.html