Our rooflights are mounted vertically through the roof of the vehicle with the light on the outside of the vehicle and the operation handle on the inside of the cab. The light is mounted with a Universal bracket designed to fit on any flat roof.
There are two different shaft lengths available for this light. Standard shaft length is 4 3/4" exposed shaft* and 10 1/4" center to center**
Shorty shaft length is 2 3/4" exposed shaft* and 8 1/4" center to center**.
Standard shaft is designed to fit Trucks and large working vehicles that have thicker roofs. Shorty is for normal SUVs and pickups that have thinner roofs and where the handle does not need to come down as far into the cab.
We are not sure what IP76 is.
*Exposed shaft – the amount of tubing visible between the head housing and handle housing when the spotlight is assembled.
**Center to center – the distance between where the gears mesh in the handle and where the gears mesh in the head when the spotlight is assembled.