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Weatherhead-Eaton brass fittings are available at NAPA (and probably at other parts stores). You will probably have to know exactly what you are looking for. Here is a link to a down-loadable catalog (it is a large file):

http://hydraulics.eaton.com/products/pdfs/E-BRFI-MC001-E3.pdf

Is your NOS kit a NOS GM kit for a 235/261 engine? What is the part number?