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I have a 1975 K5 Blazer. Parts house is showing 2 different boosters- one is a single diaphram and the other is dual diaphram- which do I need? What is the difference between the 2?
Thanks. I got to the parts house and I didn't even know there were two different styles. I got the dual and I willcompare them tomorrow. Do you know if they are interchangeable? I have since read the dual feels a little tighter on the brakes.