C1 owner looking for a powerglide relay #116904 should know that a CAR 3-speed over drive relay #116903 works the same way as Corvette. It's the same relay but that the right connector points down , were as the Corvette relay connector points right. A talented person could change it to point right. It's near impossible to find a Corvette relay, but the Car relay is often found on E-Bay in the 55 to 57 Car section. $35 to $50.00 is mostly what they go for. And if you drive your Corvette as I do you should have one with you.I'v written many articles for magazines and if I can help? ask!C1's only.Merry Xmas