Rear Diff. Bushings

When installing the upper control bushing in the axle side, will the bushings stop at a certain point when pressed in? I know they don't go all the way in, just not sure how far to put them in.

an OEM bushing has a step on it but most aftermarket poly bushings don't and you can force them in too far. center them in the cast ring or better yet, use a pair of spherical bearings...

Thanks, I just pushed them in far enough that the control arm went over them without any force. I don't think I can use the spherical bearings, have poly in everything else. Should had said I got the CHE arms and putting in the OEM bushings.