well, when you install these bearings you need an installer that will support both the inner and outer races. this is not importent when installing the first bearing, but when installing the second, you do not want to just support the outer race as the inner will make contact with the inner wheel spacer first and then as you keep pushing you are side loading that bearing again. the correct tool supports both the inner and outer together .when that bearing just makes contact with the inner wheel spacer, it's time to stop. hope this makes sense !

check service manual for which bearing goes in first to be seated.