I have wheeled my Discovery 1 for years and love it! Last year I upgraded for a lift from Rovertym, Im running their front setup with adjustable towers and 10in Bilsteins. In the back I have cones and retainers with upper and lower shock mounts and 12in Bilsteins. The problem with the 12's in the rear is that my A-Arm now hits on my exhaust.. Is the Rear A-Arm extension meant to fix this..??