Spherical Bearing kit for the E53?

[TiAgX5]

With over 150k miles on the X I am getting ready to go thru the suspension and replace the wear items. I know spherical bearing kits are available for the Zs, 3s and 5s and was wondering if anyone might have come across in info on an E53 kit. The roads I drive are in good condition (better then the Sebring Racetrack, that place pounded my Viper to no end) and would never think of doing this upgrade if the roads I traverse were potholed and/or rutted. What's not available in sphere bearings I plan on replacing with Powerflex bushings.