It's a Kingswood so not a Sandman, but a nice model anyway. Slate black interior with Atlantis Blue Met paint

Windowless - means nothing as Sandmans and non Sandmans could be either windowless or come with windows
seat capacity of 2 on ADR plate - means nothing as Sandmans and non Sandmans could have 2 seats instead of a bench seat
RTS identification - all HZ models had RTS
GTS Dash, steering wheel - could be optioned
twin headlights - could have been changed anytime or it may be the B06 pack which I believe had a twin headlight front ???
trim code 18V - Would mean Sandman if it was on a base model "M" vehicle
factory V8 - means nothing as Sandmans and non Sandmans could be a V8
floor shift - means nothing as Sandmans and non Sandmans could be a floorshift
Door Light Switches,armrest,so on....I understand these would be standard on a kingswood but not satandard on a base model "M" vehicle which is why they can be an identifying factor on a base model.