*** BEFORE ORDERING, PLEASE VERIFY REPLACEMENT SEAL PART NUMBER…For engines built with seal p/n: 1809964C92, use tool ZTSE2535C (Outside Diameter 156mm). For engines built with seals p/n: 1817867C93, 1817767C1 and/or 1817865C1 use tool ZTSE4749 (Outside Diameter 166mm). *** This tool is designed to install and correctly position both crankshaft rear oil seal and wear sleeve. Use with ZTSE4404.