I want to recommend HubBub for helmet mirrors, because they are responsive & helpful. Recently I got a new mips helmet. I tried to move HubBub mirror from my old helmet to the new helmet, & it did not fit. I wrote to HubBub, & they responded with ideas & suggestions to adjust the mirror to the new helmet. After a fair amount of back & forth, photos, etc, it still would not fit well. So they sent me a new mirror no charge, which fits fine. I think this is the kind of business that should be supported if you happen to be in the market for a helmet mirror. Thanks for ‘listening’