Have you been to the MTD Products WebSite? If not go to this address http://manuals.mtdproducts.com/mtd/public/list.jsp and type in the model number you have. I just ran through it and it gave me everything I needed using your numbers...owners manual and others. They are in Adobe PDF format and take a while to download on dialup but they should have everything you need.
Scott Deaver: B&S Authorized Master Service Technician
June 2005