This is a genuine Milwaukee replacement part, it is sold individually.
It is used on all the Bandsaw models shown below.
The purpose of the Rear Blade Guide Assembly, is to keep the blade on the bandsaw blade tracking straight as you are cutting..
It also helps track the blade on the blade pulley.
If your Blade Guide Block is in good shape and just the bearings are worn. You can order them individually under part number 02-25-0260.
These fit both the Back and Front Guide Block. There are six per tool.