They're small connectors, right? One is a sensor on the tranny, and the other I think is for the last O2 sensor after the last CAT on your '99 and maybe your 97 too.
If I'm thinking of the right ones, lol. You've got the big square one with a lot of pins that plugs into the tranny itself, one that plugs into the DTR (range sensor, on the arm the linkage hooks to), another that plugs in over top of the tranny (which is the tailshaft speed pickup), and then the one that goes to the O2 sensor. Might even be another I'm not thinking of for tranny temp or something.
The one for the O2 sensor is round with 4 pins. The others are more "rectangular" connectors.