Maybe I'm wrong, but. After reviewing the original trailing arm configuration and their replacement configuration, I don't think it makes sense to use them on the lower trailing arm. It looks like the polymer bushings will severely restrict lower trailing arm movement and possibly even break the bracket. Especially if you are into extreme 4 wheel vehicles. The OEM configuration has all of the elastic sleeve material in the arm, allowing for more flexibility. Polyethylene not only fills the hand, but also occupies all the free space between the hand and the mounts. Hence the very limited flex. Toyota developed their trailing arm for a reason.