BG55, looking for the right carb

[Fish]

Here is a snip of that bulletin. So if your unit uses a throttle rod, that narrows it down.

 

[Fish]

The other differences in the carbs are probably not that dire, so it narrows it down a bit.

 

[Fish]

So looking at the carbs, if your model has the throttle rod, this should be your carb.