IT won't do you any good. The top unit is the AM/FM Cass. The Bottom unit is the CD Changer (3 disc cart). It takes up both Slots as your 3-n-1 takes them up.

And Keir- 97 is good. 98 is good. I just think of them as better than 95-96 because you can't put the TRD Supercharger on the 3.4L 95-96 motors. But they are all good motors. (TRD and Toyota Emission changes are the reason for the SC issue).