I've never seen 2D's. The only stock carbs on the CB/CL 350k models that I know of are in chronological order:
350A, 3C, 3D, and 722A.
There are several recent threads with charts showing the engine numbers that used each. I've had folks on this board tell me to use the original carb that was jetted for the cam profile of my particular engine number. I have a K0 and was unsuccesful at rebuilding the ancient 350As that I had so I am using 3Ds.
Bike runs great.
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