Review on Efficient Ignition Switch: Standard Motor Products US43 for Seamless Performance by Mike Rice

Best price and easy replacement for my '67 Corvair. Identical to my original switch except this switch has an extra pin labeled GRD which my original switch doesn't have, just leave it unused. My machine's spade terminals were a bit loose at these terminals (thinner metal terminals?), so I used pliers to pinch each end together to secure the fit. You need very tight connections to this switch as there is a lot of current flowing through it.