Al-ko wheel locks

StephenHal

Hi folks, been looking on Ebay at alko wheel locks and noticed they all have insert or kit numbers on them. Not sure if this is just a unique number for each lock to identify it or is a number for a certain kind of wheel or size? I will be picking up my
Bailey Senator Louisiana at the weekend and was keen on some added security given its a twin axle and seems to be a stipulation for a few insurance companies. Thanks in advance. Stephen