moa, I'm still checking, but you have a two tone code (536) It should break down to 511 turquise poly and 521 white, for a 1969 gmc. Sorry I can't say for sure, I'm still checking for ya.
Fyi the model code ce1500d is not quite right. It should be CE159od for a 127" wheelbase gmc 67 to 69 gmc fleet
And the code z62 comfort and apperance is a trim package mid level.