Ok, the part number for the turn signal unit that I have is 68537-89G. I think they still use the same unit today. The "G" is the "update" of the part. Each time they update the part, they go up one letter. As with all H-D parts, the last two digits, i.e. "-89", indicates the year that the part was first adapted and put into use. The "-89" means it was put into use in 1989 and it has been modified at least seven times since. I hope this helps.
Good Luck
Steve
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