Part Number and Specifications Part # C73-515-10 Rivet spacing is 1 in. Center to Center0.080" Wire dia. by 0.325" TallRequires 1/8 in. dia. RivetFits C73-500 Tab Part # C73-525-10 Rivet spacing is 1-3/8 in. Center to Center0.090" Wire dia. by 0.425" TallRequires 1/8 in. dia. RivetFits C73-505, C73-508 and C73-510 Tabs All Spring options are packaged in quantities of 10 Dzus Type Springs for Quarter Turn Buttons This selection of Pro-werks Quarter Turn Dzus type Springs are commonly used with the standard Domed head or Flat head quarter turn buttons. And may be mounted to a Dzus weld plate or to a body panel. These Panel Fastener Springs are Plated Steel construction and are offered in two rivet spacing options. This Quarter Turn Tab & Spring works with Self Eject Buttons The Right Tools for the Job Click the image to see our large selection of fastener tools.