Abstract: A bushing between a big diameter end of a flexible boot and a tulip housing of a constant velocity universal joint. The tulip housing has a plurality of longitudinal drive channels each open at an open end of the tulip housing. Drive bearings on a trunnion on the end of a shaft are bodily shiftable in the drive channels and accommodate stroking and angulation of the shaft relative to the tulip housing. The bushing has an integral boss aligned with the open end of each drive channel. Each boss has a pair of channel segments aligned with planar sides of the drive channel which segments define extensions of the drive channel. The channel extensions receive the drive bearings if the bearings become dislodged from their drive channels during installation of the universal joint on a vehicle.