When looking for a replacement multi point door lock, there are a sizes / dimensions that you need to measure. We have sorted all of our available locks into specific sizes related to the lock back-sets and PZ centres. For example, our 35mm / 92mm category will list all locks with a 35mm backset and 92mm PZ centres.
Backset Dimension - measured from the front of the lock face plate to the centre of the spindle (follower) hole.
PZ Dimension - measured from the centre of the spindle (follower) hole to the centre of the top diameter of the lock cylinder (barrel) hole. (If there are 2 spindles always measure from the top spindle hole).