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 equipment. It is a VERY good catalog! It has parts in bulk. Morrison Outdoor Equipment has parts and Brigg valve guide tools and valve guide bushings. Check Google for updated numbers for Brigg Parts numbers.