The anti-rotation limiters have soft stops going in both directions. One way you are against rubber donuts while the other is a steel spring. Least that's how most are. Do post photos when you can.
The front one attaches to the a- arm and has the rubber bumper the rear is for a rigid Axel and does not have the rubber bumper, I thought they were missing but looking in the manual the solid Axel type do not have it but machines with a arms in the rear have a different mount with the rubber bumper. The manual also gives measurements for initial set up. Marty