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Some parts suppliers do not want that information published. Not because they are hiding, but because they are small one man operations that are not set up for direct sales, usually making the parts in batches as order comes in. Not every parts supplier is a big company. Some that do advertise, sell the parts retail or close to it so are not competing with their bread and butter, filling orders to the parts wholesale suppliers like Snyder's. Made in USA or China etc, that is different.