Not all ball joint are created equal. That's why AFCO uses the best components from the top manufacturers. There are many different design characteristics and manufacturing processes that account for the quality and performance of ball joints. These joints will give you the AFCO advantage! WillNOT fit stock GM pickup upper A-frame or spindle taper. Application Fits: Mastersbilt, GRT, American Made, Swartz, Bernheisel, Rocket, Howe, Shaw, Bullitt, Rayburn, Harris. Notes: This ball joint uses the Ford taper found on Mustang II/Pinto spindles. Common on IMCA Modifieds - very durable and economical replacement item. This ball joint will NOT fit the stock taper in a 1963-71 GM truck spindle