replacement heater blower motor

[BrianG]

Has anyone else purchased a new heater blower motor? I just bought one and it has a fairly larger (maybe 3/4 inch) hole in one side of the motor housing. I know on some models besides our style, this would be where a cooling tube would connect. Ours obviously do not have such a cooling tube. The parts store guys have looked through all of their sources and they cannot get one that does not have this hole. It just doesn't seem right to leave this open to the environment. Has anyone else noticed this, and if so, what did you do?