24” Optispark Vented Harness fits 95-97 LT1 applications. This is the small harness that connects the optispark to the main engine harness on the LT1 engine. This is a new replacement for your old harness. Chances are if you are going to replace your optispark the tab that holds your old harness in will break off. This is also needed if you are converting to the vented optispark. 24” Optispark connector harness fits 95-97 LT1 applications. Fitment 95-97 LT1 Camaro 95-97 LT1 Firebird 95-96 LT1/LT4 Corvette 94 1/2-96 LT1 Caprice/Impala 94 1/2-96 LT1 Roadmaster 94 1/2-96 LT1 Fleetwood