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There are three types of shaft bushings used in Autolite/Motorcraft distributors. Early distributors have one bushing-B8QH-12120-A. For 1965 and later, you can expect the C5AZ-12120-A bushing (main bushing) through the top and the C5AZ-12132-A through the bottom (lower bushing). Not all distributors will have the lower bushing. Although widely reported that these bushings are unavailable, they can be found through obscure sources. If you go to www.amazon.com, you will find all three of these bushings. Bearing companies, such as WBParts Aircraft Parts Procurement Service, is another source. Just give them the part numbers.