GTS or GSS

There is a great discussion on a wanted thread and to be fair tho the OP the conversation needs moved here. Have at it guys.

Sorry TMM...I really do know better...just got caught up in the discussion and forgot it was a wanted ad...Flog me with a wet noodle if you must!...LOL

Well this is starting to make some sense to me. A buddy sent me pics 5-6 years ago of a friends 68 dart and swore it was an M code. I told him that only 69 were Mcodes. I was wrong...again.
I cant remember if he sent me a pic of vin or fendertag with the M in it.
Would M be in fendertag for 68 or 69?

Steve/TMM...that was kinda my question. I have always thought that an "M" designation for an A body could only be for a '69 Dart/ 'Cuda. Over the years, I've heard mention of '68 "M" codes. My question has been (which I've never gotten a proper answer to) is "Did Chrysler issue factory VIN tags with an "M" as the engine digit in 1968 specifically for Mr Norm's cars?...and were '68 Barracuda's included?