So, no connection to plants from hidden vins.
No way to track if this is something coming out of one plant or all.
I guess everyone with an I in their vin is scared to post the full vin because they will be ridiculed and the value of their car goes down. Quite unfortunate.
Looks like the only connection able to be put together would be that this happened in the year 71 only.
Josh - No Hidden Numbers - I have had 4 cars down to nothing with every possible nut, bolt, panels, glass removed - only the original shell completely bare. Removing undercoating with some light sanding and or paint removal. I have gone over every single square Inch checking everywhere inside, outside all frame lip area's, window channels, trunk, hood, inner fenders, floors, roof on 4 cars 1970 - 1971 barracuda and cuda. A couple of these cars where bare for a couple years for my inspecting, even with friends to look as well. Only finding body X sequence stampings - NEVER VIN NUMBERS
one car had a very nice 426 stamp just above the rear side window channel.