SnowBuck you are my hero. Thanks for the great suggestion. After searching 3 salvage yards and finding 5 Suburbans that were all broke in the exact same place I came home and began searching the internet. Somehow I stumbled on your post.
With nothing to lose, I tried your fix. It worked perfect.
I used a 5/64 drill bit and drilled the hole in the thicker part of the plastic piece, just above where the cable sets in it. Then I inserted a #4 x 3/8" metal screw with a pan Phillips head and a #4 x 9/16 washer into the hole I drilled. Holding the cable in place I tightened the screw down to where it rested on top of the cable stem. I was careful not to over tighten the screw and I tightened it by hand so it would not strip or snap the plastic.
The entire fix process took less than two minutes. Figuring out what size drill bit, screw, and washer took about a half hour to locate.
This was a great suggestion for what appears to be a common problem. To replace the part with a new one is several hundred dollars. Finding a good one in an auto salvage yard is not likely. Using this fix will cost less than 1 dollar and less take two minutes. That's a good fix.
Thanks SnowBuck !