The SL 27 yoke fits a wide range of Kirby Morgan helmets with a similar neck ring clamping system.
The yoke fits in between 2 split rings by way of hexagon headed screws.
Kirby Morgan recently legthened these screws from 1/2" to 9/16" for maximum thread engagement.
|Viking Superlite 27/17K/17C/37/47 Yoke||V-112271001|
|Viking Superlite 27/17K/17C/37/47 Yoke HDS material||V-112280001|