To get parts for a carb, you need the numbers off of the carb. There should be a tag on the carbs or a stamping on the carb that would have the numbers to identify the carb for parts. Any reputable auto parts company should be able to take that information and determine whether there are parts available for it. Otherwise, there are a few places around the country that rebuild old carbs and will sell you the old parts (at a premium I might add). If you get me the numbers, I work in an Auto Value locally owned auto parts store and may be able to help you identify what parts are available.
Ralph in Minnesota
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