We can find rarity in just about any model and year for Mustangs, and not just the '65-'70s.
Marti Reports perpetuate this with his approach to the ELITE report breakdown, getting each car down to 1 or 1 suggesting they are extra special.
He has no consistency in how he gets there. Most cars are defined by body style, then engine, then trans, then paint, then trim, but...
but Marti finds some obscure option to get that down to 1 of 1. An example would be 1 of 1 with a tissue dispenser or with an electric clock.
Technically it might be a 1 of 1, but that's not what really matters to most enthusiasts.
On these '67 K-codes sometimes Marti will note if it's a GT option in the breakdown. (It's always the same number as the paint quantity.)
Why...because as I learned right here on the SAAC forum, all '67 K-codes were mandated to have the GT option.
Yes, rarity is all about perception.
a previous topic on '67 K Codes can be found here.http://www.saacforum.com/index.php?topic=2382.msg20527#msg20527