Owners handbook
Just call your Sears service center. They have the microfiche on all of the products and depending on the year, can get most parts. I recently bought a 7-1/2hp Ted Williams 73 model and they have just about everything for it. Generally, the Sears engines were made by either Eska or Tecumseh. Lots of the Tecumseh parts are common to lawnmower parts and are available through lawnmower suppliers. I have found an individual here in Oklahoma that services these engines out of his home and he has a huge supply of parts and the know how to keep it running. I can share his name and number if anyone is interested. bobf38@worldnet.att.net