UPDATE on my $600 "mistake."
i called PGClassic today. they're in Canada and "talk funny." i explained my mistake in getting the wrong year dash for my Barracuda and they said "no problem, just send your dash bezel back and we will exchange it for the right one you need." i asked if there would be any additional charges and they said "no."
so it looks like the only money i'm going to be out will be some shipping costs to Canada.
i'll post the final outcome of my "drama."