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If anybody wants it, I've got a brand new diaphragm for a 1955 Olds dual action fuel pump for the vacuum side of the pump. I was rebuilding a pump for my 1954 Super 88 and Fusick had the wrong diaphragm in the kit. The sent me the correct one straight away which took care of the problem. The difference is the end of the connecting rod and how it hooks to the actuating arm. Here's a picture. It's free, just pay for the shipping.