I was on Revzilla to order mirror adapters https://www.revzilla.com/motorcycle/...bar-end-mirror so I poped out my left bar cap and it looks like its 1" but then it gets smaller about 1 " in ward, So which size adapter do I need 7/8 or 1" ? thx. Well I call Revzilla and they said a 7/8 should do it .