I'm almost 100% certain that the grip sizes on a Multi and an ST are identical so you shouldn't have any problems getting the grips to fit. The only thing that might be specific to a Multi might be the amount of cable they provide to wire them up or maybe they've got a plug on them that fit into a ready made socket on the loom or something.
Mind you, running a suitable feed from the ST loom or power socket shouldn't be too difficult
Jools
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