You are purchasing 2 gas struts, most commonly used for the SIDE window of your ARB Canopy.
The gas struts measure 325mm between centers when the canopy is in the open position and the gas struts are fully extended. They have a rating of 160N.
They are ideal replacements for Stabilus 1921VR.
Struts West have your ARB Canopy gas struts ready to go at a fraction of genuine replacement cost and these gas struts are super easy to fit too.