1990 Maxima need help with Replacement Parts

Does anyone know where i can find.. I'm not for sure what the part is called. But I have a manual transmission and when u lift the piece to where the shifter rod is going towards the transmission , you have to remove the heat shield in order to remove it. I got one at a junkrard but it has cracks in it and is not going to last very long. Does anyone know where i can find a new one? Also i need a oil switch it is below the oil filter, you screw it in to the engine block and is connected with an electrical connector