Well, I think I can add my two Eurocents of contribution to this.
The newer bezels and grille will fit, with some minor modifications. I did this same thing on my 1984 XJ last weekend. Here is the story for those interested:
1. On my Jeep the grille and bezels were surrounded with some additional parts, like a chrome bar on the top and a chrome bar at the bottom. These need to be removed, as well as the original bezels. The tough part is the lower chrome bar, which is attached to the front of the truck with several screws. Some of them can be removed from the front, but at least two of them require that you slide your bumper out a bit, to be able to reach them with a small ratchet wrench. After you remove these, you may put the bumper back to place.
2. The newer bezels were not a perfect fit. But all you needed to do to make them go in, was to trim a little the plastic in a certain spot and drill two new holes on the fender (where the rear lip of the bezel attaches to the fender). Then the bezels will go in like a charm. You will notice where you have to trim the bezels when you try to put them in place. The part that needs to be trimmed will prevent the bezels from seating properly. Trim that and it will be fine.
3. The newer grille is taller than the older one, but since the two chrome bars on the top and the bottom are now removed, it will go in fine and fit properly. As a precaution, leave the bezels a bit loose, so that you can adjust them in their final position, when the grille goes on. In that way, you will be sure that the edges of the bezels go correctly under the grille.
E-mail me directly if I omit something that you need.
Kind regards
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John SV1CEC