What are the differences between J carburettors? West Germany (E22), Austria (E39) and Switzerland (E18) have different P/N for the carb bodies.
This makes me think that either the casting or the slider sleeve (how is it called?) are different. Slider sleeves do not have any P/N, ther were sold as part of the carb body.
How can you tell which spec is the carb? Are they marked?