ITM Engine Components engine crankshaft seals offer high quality OE type replacement sealing components at a great value featuring state of the art manufacturing technology and premium materials. We use the latest manufacturing technology along with raw materials sourced from us, Japan, and Europe for ensured quality. These rear main oil seals are designed to meet or exceed OE performance standards and fitment. ITM engine crankshaft seals are designed to be a durable replacement for regular street use applications.