It is likely that your "csi" vehicle was originally equipped with rear vented brake rotors. To fit the width of the vented rotors, your calipers would have been equipped with spacers. If, for reasons unknown, your vehicle has thinner, solid brake rotors, then the spacers are unnecessary.
Indeed, spacers needed for vented discs.
Walloth even sells the spacers separately to be able to upgrade a non-vented setup (originally only on 2800 cs models i think?) to a vented setup, without having to exchange the entire caliper.
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