Thx Bob for the background- I couldnt figure out why everyone thought it was a grill swap when it looked stock to me - which I guess it is, just not the right era.
They did a nice job of it.  I like it.

Here's  a 66 last year for that stand up grille. As said the sheet metal remained under the revised grille for the duration of production so the swap was relatively easy and looks so much better in my opinion.

I was wondering what is the deal with those bumpers - they look aftermarket, as I believe the Grand Wagoneers had chrome bumpers right up until the end in 1991.

I might be wrong on this, but my memory is of these vehicles pretty much being responsible for today's popularity of the SUV.  When Jeep started outfitting Grand Wagoneers like luxury cars they became quite a hit with influential people who wanted luxury but wanted to project an "outdoorsy" vibe.  You started seeing Hollywood types with them, and the other makers saw that and started bringing out their own versions of (truck-based) luxury SUVs, eventually evolving to where SUVs are now becoming the mainstream vehicle with many manufacturers eliminating sedans from their lines.  That's how I recall it anyhow - I remember being surprised that so many people who probably never would have driven a truck before, suddenly buying big SUVs because they were the 'in' thing.

Here's a page from a 1989 Jeep brochure.  By this time the Grand Wagoneer only had a small photo as Jeep was trying to promote their smaller versions, which became very popular in their own right.