motor mounts
Technically, a motor converts electrical energy into mechanical energy. An
engine converts chemical (or heat) energy into mechanical energy.
A motor = "electrical motor". Engine = "internal combustion engine".

A joking aside, as you've discovered, the inserts are the raw mount material,
in which the clamshell is re-used. The complete mount includes both the
insert and the clamshell as a unit. Ironically, they are both referred to
interchangeably as "motor mount" or "engine mount".


