To ensure that you get the correct timing belt, it is best to check the size and shape of the one currently installed so you can compare with the listed belts. Some important information for selecting the correct timing belt is the type of belt needed; number of teeth, amount of and type of driven units, pulley compatibility and date limitation of the unit. As car manufacturers regularly update certain peripherals and design of their models, some timing belts will only be suitable for particular models of certain years.