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Depending on circuit design and pin layout, it is often necessary to insulate the flat back metallic side of transistors from ground. This used to be done with thin sheets of mica with heat sink compound. Now many applications will use manufactured insulators such as silicon, or such. The idea is to transfer heat, but not be electrically connected. I would say that if the insulators were found in place, install the new transistors with them in place. I would verify isolation with an ohm meter also. Otherwise,? you may get unwanted smoke escaping from other components.