The TRD filters have their own metal center tube and the cheaper filters do not. You just drop the TRD filter in over the metal center tube on the filter housing.If I understand you correctly, the center tube that holds the paper filter must be in there.
I bought the metal housing that fix Lexus and FJ's. I had to swap the center tubes, as there were different sizes.
I've been thinking about buying the metal housing as well, ~$30 on ebay.