I'm at the end of a frustrating day. My Sturgeon fishing trip was interrupted when my boat got stuck in reverse. I took a closer look at the controls and found that they had been band-aided together by the previous owner. What is missing is a metal insert that keeps the cable sheath from sliding while the cable slides in and out. Here is a photo of the area where the insert would go:
 
And here is a shot of the other cable that shows what the broken one should look like:
 
And here is a closeup of the insert that I need:
 
Does anyone know where to get one of these? Does anyone have an old set of controls that I could buy for parts or to replace my whole setup? 
This is a factory set of controls (I'm assuming) that is on a 1980 model. Maybe it's just time to replace them. I don't know...
Thanks in advance for your advice on this!