Sorry for the multiple posts today. I just have a few things left. This NBC special was already posted here in around 2015, but the YouTube video has been privatized. Here is my copy of it, from a betamax transfer to DVD.
MP4 Version: https://archive.org/details/elvis1978/
DVD Version: https://archive.org/details/elvis1978dvd (You will need to download everything then click on the VIDEO_TS.IFO then select the top selection, as selecting VTS_01_1.VOB directly won't work. Sorry for the inconvenience.
One last thing. I have The Elvis Coverup II from 20/20 from December 1979 on the DVD as well and is up on my YouTube and will also be on the DVD listed above.
MP4 Version: https://www.youtube.com/watch?v=NaOcZoTkBtQ