Color code ..Can it be that rare ?

a cuda renctly sold :

Plymouth Cuda. All original numbers matching 360 4 speed! This car is absolutely beautiful inside and out and is one of 398 built with the 360 4 speed. It was ordered with the "Sure Grip" Posi traction 3.23 rear end. It is painted in a one of one known in factory Dark Moonstone Metallic paint code- KL8. It has Factory white interior with Pistol Grip and console. it has a matching white vinyl top with rear mounted luggage rack. Car is stored in a controlled heated enviornment and is covered when it is not driven. This 'Cuda is documeted in the Chrysler Registry by Galen Govier. Car is a multiple 1st Place show winner in EBody stock class and has trophied at nearly every show it has been taken to.
Fender Tag Options
R11 V6W 26 L2 133
M31 M88 N41 N42 N76
C64 G74 J54 M21 M25 M26
KL8 C B41 C16 C56 G54
KL8 A6XW 000 207 C27583
E58 D21 BS23 L4B 324962

by seing this car on sale on internet i was like really ? that rare ?