The bag is made to fit like a glove in the standard OEM side cases, not the Raid Edition (Givi) cases. But the standard cases are 29 and 32 L and the Raids are 37 L. So the bags should definitely fit, if a little loose.
That said, I think they're great bags. I've had mine for several years and they're keepers. They fit the cases great and, because they have their own form, it's easy to pull them out and slide them back in even when they're packed. They've been very sturdy. The double zipper with a single pull takes a little getting used to, but once you get the hang of it, no problem. And it means the top opens completely which makes packing easier. I find these bags way easier to use than pannier-sized dry bags which don't have a shape so end up requiring a lot of fiddling to load when they're packed (for me, anyway). But dry bags stay dry no matter what...the Yamaha bags aren't waterproof. But my cases have never leaked, even in long days riding in downpours, so that hasn't been an issue.