Go to the Brigg's & Stratton main website. They have all the part lists and part diagrams. When you see the prices for parts, you,ll be better off just to buy a new engine.
Where Can I Find Free Repair Manuals For A Briggs And Stanton Engine, That Shows A Exploded View Of The Internal Parts Of The Block (crankshaft,pistons Things Like That)?
Not sure if this will help but try sears look up parts , I'm sure there are diagrams of b and s engines in there.