Treasure that kit, it is an OOP kit.
A Shop close to me still has two of those on the shelf, really have to go and get myself one of them.
IMAI Instructions should refer to the Gunze Sangyo range of colours, normally they are eitehr given with an Hxx or simply the number xx depending on which of the colour ranges they are refering too.
Again as was mentioned above, on Bikes really anything goes. Most Bikers somehow will personalise their rides, may it be accessories, paint scheme, etc.