NH5.0

I am having trouble getting the correct TPS for my 92 5.0 LX. The ones they have at Auto Zone do not have a " cover" on top of the sensor to prevent debris from collecting between the sensor and the top tab of the throttle. The original sensor has a cover but it appears to be molded in , so I cannot just put it on the new one. I hope I am making sense here. Has anyone else had this dilemma or am I just having a brain fart? Thanks, NH