My research suggest 1978 is all by its self but may fit 1973-77 with minor differences. Turn signal switch needs replaced. If you have any questions please call Kurt. The item "73 74 75 76 77 78 CHEVROLET C/K BLAZER SUBURBAN AUTOMATIC TILT STEERING COLUMN" is in sale since Wednesday, November 18, 2020.This item is in the category "eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Interior\Switches & Controls".weaverfamily" and is located in East Earl, Pennsylvania. This item can be shipped worldwide.