Rally power meter pedals are built so the body can be replaced without replacing the spindle that does the measuring. That is what these are: replacement bodies for Rally RK, RS and XC pedals, in sensing and non-sensing versions.
A sensing body carries the power electronics for that side. A non-sensing body is the plain half of a single-sensing setup. Match the version to the pedal you are repairing — a dual-sensing meter needs sensing bodies on both sides, a single-sensing meter needs a sensing left and a non-sensing right.
Cleat systems follow the pedal family: RK takes Look KeO, RS takes SHIMANO SPD-SL, XC takes SHIMANO SPD. Bodies fit their own family and use Garmin’s quick-change interface.
