Thanks once again HK. So basically the first 4 numbers in the trim are basically for gmh production use for their paints, and have no real relevance to id of genuine sandy.
The first 3 in paint is basically the finish or type of paint gloss, metallic etc. the last 5 numbers are the gmh actual colour codes that can be used to id the paint colour eg absynth yellow and which can help id a genuine sandy as well as the correct trim codes.

Eg TRIM 1905 gmh use, 19v black vinyl
PAINT 568 solid, 17342 lime
What about the sandman decal colours is there any way to identify the original colour decals from factory when restoring or is there no way to find this out.
Thanks everyone.