Not sure exactly what you need but this thread was about rivnut /plusnut used on 693 poly corn head to hold ear saver flaps in place.

http://talk.newagtalk.com/forums/thread-view.asp?tid=424375

That post contained a couple links one of which is broken.

I've fixed them here.

http://www.cardinalcomponents.com/popular-rivnut-tools.html

http://plusnuts.com/