Repair Clinic and E-Replacement Parts have parts. E Replacement Parts has exploded views of equipment. Amazon has parts in bulk. Stens has a FULL-LINE catalog for ALL kinds of 2 and 4 cycle parts. It is a VERY good catalog! Amazon may have it. Morrison Outdoor Equipment has parts and Brigg valve guide tools and valve guide bushings. Check the Brigg manual for numbers. Brigg numbers change. Check Google for updated numbers.