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Aren't they earlier than 1967? I only see 4 bolt holes, not six. Edit, take it back, blew the pic up and now see the corner holes.



4 bolt covers were used up untill around late 63 i thought. but if you look real close, you can see those are 6 bolt covers. the missing hole[s] is in the shadow of the cover on the upper rt side flange with the pvc valve.