A solenoid heat shield becomes needed when the position of the solenoid is located near the exhaust manifold in an internal combustion engine. Solenoids without heat shields may be heat damaged causing the solenoid performance to reduce. Your Corvette has this particular kind of internal combustion engine.
This Starter Solenoid Shield is black and is a quality GM part. It’s made for a 350ci engine, and it fits C3 Corvette year models 1969-1974.