New Old Stock inked D1ZF-10A352-A2A, for Boss 351 or 429 Cobra Jet use. Bright golden zinc dichromate machined steel 1-sheave pulley. Measures 3-29/64” OD x 0.669” ID w/ a clean bore, straight un-used flanges. This is the solid version which appears like a Hipo 289 or Boss 302 pulley, however the stamped steel version looks different & a bit more ordinary. It’s an OEM Ford item w/ correct fit & function for a mach 1 / Boss 351 / Grande / Cobra / Mercury XR7, why go aftermarket.