Chain keeper arrived and installed today. Took it for a ride and rode it over the chatter bumps on the gravel road that would throw the chain before....no problem.
Did it a second time, but faster and I was almost thrown off the bike...chain stayed on.
There is about an 1/8" clearance on each side of the chain links and a 1/4 on the top.
I couldn't get it mounted exactly like they pictured because I didn't have enough room to lower it any more. So, I tilted the very bottom to make it fit.
Glad that it fixed it.....Thanks for the help.