There are a wide variety of seals on a typical vehicle, from door and window seals to essential seals in the engine and moving parts, all of which help to block out harmful elements and keep the vehicle and its peripherals safe and tightly sealed. To ensure that you get the correct crankshaft seal, it is best to check the size and shape of the one currently installed so you can compare with the listed seals. Some important information for selecting the correct part is the type of seal design needed; thickness, diameter fitment position, material and date limitation of the unit. As car manufacturers regularly update certain peripherals and design of their models, some crankshaft seals will only be suitable for particular models of certain years.