This is the Billet Internal Adapter for the LS 3.2, LS 2.2, Arrow, Hindsight, Hindsight LS and Blindsight Billet Bar End Mirrors. 
We make this assembly to offer an alternative to the basic Bar End Mirror mount.*

The 7/8" Adapter kit assembly will work on bars with internal diameters as small as 12mm (.475") and as large as 19mm (.750"). 
This range covers virtually all aluminum and steel bars/clip-ons.

*Whenever possible we recommend mounting the Hindsight Billet Bar End Mirror with the basic mount which clamps to the outer diameter of a 7/8" handlebar/clip-on. 
Using the basic mount is the bar end mirror solution using the fewest parts, facilitates the easiest installation and removal, is the lightest weight, and provides for the most secure bar end mirror mounting. 
Use of the basic mount requires having 10mm (3/8") of bare bar outboard of the grip/throttle assembly. Before purchasing the mirror adapter, try moving your grips and controls inboard (away from the end of the bar). 
In many applications, the mirror can be mounted with the basic mount.

The 1" Adapter kit assembly will work on bars with internal diameters as small as 18.3mm (.720") and as large as 22.25mm (.876")

Sold each

7/8" - IA-100
1" - IA-200

Sold Each