Difference between different Drifter 1500s?

[chief]

Don't have a clue... will have to look into that!  But, I know of no differences in shape or connection.

[dakuhosu]

I know there is a difference in tanks and the left side engine cover but what other differences are there in the different Drifter 1500 years? Is there a difference in the air cleaner covers at all? Why would Zambini have two different sets of Emblems for a 1500? Any takers?