Help with buying a guardian bell for my dad

Hi, I’m not sure if this is the right subreddit to post on, but it’s worth a try. Since Christmas is coming soon, I thought I’d buy my dad a guardian bell as I have seen a few videos on it and since some people believe it should be gifted to “work”. However, I have also read it’s mostly for Harley bikers and my dad owns a sportbike (Ducati), so I was wondering if anyone has any advice if it’s a good gift for such a bike or if it will get in the way of riding. Also, I’m from Europe and I can’t find any good websites to buy it from since most of them are from USA and the shipping is too expensive, do you have any recommendations for good websites for a guardian bell from Europe? Thanks a lot!