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Looks like Mjfnet has the 9.9 Long shaft according to his Model/Serial number.
He also has the Manual Start model and a few other Letters missing for the year etc.
9.9/M/L

Below is a photo of a "Four Stroke/ 9.9hp/ Electric Start/ Long Shaft/ HPB" telling us what year
Some of you Mercury folks can tell us what year this is?

Always interested in seeing variations and what works best for different boats and owners.