How Rare is this Shamrock Green '79 Silverado?

[Shamrock43]

In regards to the bucket seat interior. The SPID on my truck shows XMG4 MY CUS VIN HI B for the white bucket seat interior. The truck is Shamrock Green and the dash pad, carpet, and lower door panel carpet are all green. XMG4 got you the matching carpet and dash pad, otherwise you got a gray dashpad and carpet. I read that this option was only available if you ordered the truck in Shamrock Green, Carmine Red, Brown or Blue. I don't recall the codes for the brown and blue. The buckets were the same ones that came in a Blazer of the same year. The passenger seat in the BLazer slid forward and tilted. There was no reason for the bucket seat in a pickup to slide and tilt and instead it was made stationary. No way to adjust the seat. The passenger seat sits about 2" higher than the drivers side. You don't notice the difference much from inside but you can see the difference when you look at the seats through the back window.