The response to my inquiry from the helpful folks at Downwind Marine is below. My pump is a two-bolt pattern. Just ordered their repair kit for 202M-03 and 202M-07 for $48.
Thanks again Dennis for the recommendation. -- "Dear Rayn According to our Atomic 4 reference information, and if you have an Oberdorfer water pump for your older Atomic 4 motor – it is most likely the202M-03 or 202M-07 series – with a 2-bolt pattern right? If not 2-bolt up pattern you should contact C&C and learn what pump parts were used in the build-out of your model boat – or see if there is more info somewhere what other water pumps Atomic 4 might have used in water pump bolt-up in 1976. For 202M-03 and 202M-07 you will then need the Mfg# 10725 service kit - SKU# 40385 – see web page link for more information: http://www.downwindmarine.com/Oberdorfer-Model-202M-Rubber-Impeller-Pumps-Universal-Engines-p-91002307.html Sincerely, Marcia Downwind Marine"
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