Looking at those original planes on Google images, they were badass.
Looking at the picture, it isn’t just the engines that are missing. The entire nacelle is gone.
There used to be a sorry excuse for an aircraft museum next door to the plant where these were made. Maybe someone could get some parts from them. As I recall from driving past a few times, a lot of their displays weren’t complete planes, anyway. Not like anyone would miss a few more parts being gone. - Just looked on Google - they do have a JetStar like I remember. Looks like they’ve come up with some more parts for some of the planes - they don’t look nearly as bad as they did a few years ago when I drove by. http://www.mariettahistory.org/aviation-wing JetStar nacelle in right most picture.