That should work. Wonder what's different about the ones that keep falling out though? On all the Centech's I've seen and done, the grommets fit the stock holes just fine. They fit the holes you have to drill in the earlier model Broncos even better.
Never had any trouble. Though this last one (a '77) did take two people to put them in all the way. Didn't think they were going to catch the lip at first, but they went in just fine with more persuasion from younger and stronger hands.
Good luck. Post up pics when you get the alternates done up.
Paul