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Well its a wheel bearing hub assembly that you need to buy. Autozone has a Timken/Wheel Bearning/Hub Assembly-front its $79.99 and they have the Duralast/Wheel Bearing/Hub Assembly-Front $51.99
Measure from the center hub of the front wheel to the center hub of the rear wheel.
The bearings are not replaceable, they are a part of the rear hub assembly - the studs and the bearings are pressed in - replace the whole hub assembly - 4 bolts are holding it. Rear bearing/hub bolts (new only) are to to be torqued to spec. [2000 Montana - 85 Nm (63 lb ft)]
Fron or rear?
http://www.paulstravelpictures.com/GM-Wheel-Bearing-Hub-Assembly-Replacement/index.html
The frontdoes not havea "wheel hub assembly". It is an individual sealed roller bearing that has to be pressed on and off the front spindle. It is a Toyota thing!
You need to replace the rear wheel hub - bearing and speed sensor inclusive
You replace the wheel bearing hub assembly - it has studs, bearings and wheel speed sensor around $100 part
Wheel bearing is part of an hub assembly. Remove wheel, remove caliper & rotor. Disconnect speed sensor, unclip connector. Remove shaft nut in front & 3 bolts in back - replace with new hub/bearing/studs/wheel speed sensor assembly tighten to spec. You need to also remove the big shaft nut. When replacing make sure axle nut (33mm) is torqued to spec. [160Nm (118lb ft); hub bolts (13mm) torque spec: 130Nm (96lb ft) - 2000 Montana]
remove wheel, caliper,brakes,rotor. unplug abs connector and unbolt hub. install is reverse.
You need to remove the hub assembly and replace it. It consists of bearing, studs and speed sensor. The wires are attached to a connector which is clipped to sensor shield. You cannot remove sensor on Montana without removing the hub. The sensor is a part of assembly.
With a Wheel Bearing Hub Assembly, you might get both the wheel bearing and the hub assembly. Sometimes, especially with FWD vehicles, the front hubs will not have the bearing with them but the rear hub assembly will. Most part manufacturers will follow what ever the auto company recommends.