The LM was the replacement for the G$, the Twin was out of production by the time the LM rolled in.

There is a couple of differences, the most noticeable is the G$ has a shorter main jet, with a separable plastic spray tube, while the LM has a longer main jet, with a thinner tip, and an emulsion tube permanently fixed into the stem in the centre of the float chamber.

Cheers
Ty

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