A front shoe (21) as a sliding element (50) has some support walls (51, 51),facing each other in vehicle width and a torque wave (52),which is arranged between the two supporting walls (51, 51). a support beam (23) as a support element (60),which carries a moving panel and moves integral while connected to the front shoe (21), has a joint block (63),which has an intervention section (62) for the torque wave (52) and serves as a second connecting section (J2) connected to a first connecting section (J1) on the side of the front shoe (21). In addition, the joint block (63) is positioned between the two supporting walls (51, 51), while it is relatively rotatable around the torque wave (52). A damping element (75) is located on the joint block (63),which is inserted between the joint block (63) and the support walls (51, 51) while attached to it.
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