{"product_id":"wilwood-170-12538","title":"Wilwood Front Rotor Adapter for Mustang Four-Lug Brake Conversions (1965–1966)","description":"\u003cp\u003eThis Wilwood Mustang rotor adapter joins a six-bolt ring to the dedicated hub. Confirm its disputed offset before ordering; it is not a wheel hub. Wilwood Engineering, founded in 1977 by Bill Wood, is based in Camarillo, California. The company designs and manufactures disc brake systems and supplies master cylinders, calipers, brake rotors, valves, fittings and lines for motorsport, street-performance and specialized installations. Select each component around the complete system’s requirements.\u003c\/p\u003e\u003ch3\u003eTechnical Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer part number:\u003c\/strong\u003e 170-12538\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal clearance diameter:\u003c\/strong\u003e 5.20 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting-face thickness:\u003c\/strong\u003e 0.32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHub-side hole clearance diameter(s):\u003c\/strong\u003e 0.390 inches; these are clearance dimensions, not wheel-stud thread sizes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-listed attachment hardware reference:\u003c\/strong\u003e 230-12176; verify the specific rotor and attachment arrangement before ordering hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent:\u003c\/strong\u003e Rotor-Mounting Adapter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface finish:\u003c\/strong\u003e Black E-Coat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotor mounting method:\u003c\/strong\u003e Fixed Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition in the specified brake assembly:\u003c\/strong\u003e Front\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHat\/adapter offset:\u003c\/strong\u003e 0.750 inch on the product page; 1.07 inches in DS921. Confirm the supplied dimension and measurement reference with Wilwood.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotor attachment interface:\u003c\/strong\u003e 6 x 6.25 inches; rotor attachment, separate from the hub flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHub-adapter attachment circle:\u003c\/strong\u003e 5 x 3.35 inches as listed in the product catalog; this fastens the rotor adapter to the hub and is not the vehicle wheel pattern\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter register diameter:\u003c\/strong\u003e 2.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotor mounting hole\/thread designation:\u003c\/strong\u003e 5\/16-18\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cp\u003eThis rotor-mounting adapter is used with the dedicated hub in Wilwood’s 1965–1966 four-lug Mustang front conversion, documented in DS921. Its five-hole adapter connection is not the vehicle’s four-lug wheel pattern. Wilwood gives 0.750-inch offset on the product page and 1.07 inches in DS921. Confirm the supplied adapter and dimensional reference before ordering; no equivalence between the measurements is assumed.\u003c\/p\u003e\u003ch3\u003eManufacturer Reference\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.wilwood.com\/Hats\/HatProd?itemno=170-12538\"\u003eWilwood component specifications and dimensions\u003c\/a\u003e · \u003ca href=\"https:\/\/www.wilwood.com\/PDF\/DataSheets\/ds921.pdf\"\u003eAssembly instructions DS921\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003ePMB Performance can help identify the required brake component with over 20 years of parts experience. Send the kit details and original-part measurements.\u003c\/p\u003e","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":67730118639794,"sku":"170-12538","price":173.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0521\/8792\/2610\/files\/Big_Brake_Short_Offset-6blt-5lug-xl.jpg?v=1792173047","url":"https:\/\/pmbperformance.com\/products\/wilwood-170-12538","provider":"PMB Performance","version":"1.0","type":"link"}