O2 Sensor Connection Question

I then ordered ones for a 98 z28 and they came in and there was no plastic connection at the end of the wire. It just had 4 wires comming our of the wire housing and came with some connectors you slide each end of the wire into and crimp. I dont want to cut my current plug in setup and use those, and I dont want to soder them, just want to keep the simple plug in o2 setup.
So can any of you guys tell me what o2's I need to order to get some that come ready to plug in?
OR
Do I need to remove the wires from the plastic plug end of the old sensor and fasten each wire from the new sensor into the plug?
Any help would be appreciated!
Thanks guys
Eric


