prior art but have a comparatively complicated geometry in the lower and upper region with respect to the z axis the receiving openings 14 16 are each provided with segment shaped conical sections 30 32 when viewed in the direction of the y axis which each widen towards the axial end of the receiving openings 14 and 16 the two conical sections 30 and 32 are connected via circular cylindrical segment sections 34 of constant diameter this can be seen particularly in the longitudinal sectional view containing the z axis according to fig1 b the lateral vertical surfaces which can be seen in fig1 a to 1 c and which connect the upper and lower segment of the conical regions 30 and 32 to one another are of substantial planar form this can be seen particularly in fig1 a and 1 c furthermore in fig1 b it can be seen that a thread insert 40 is provided radially outside the receiving openings 14 and 16 this insert is closed and embedded in the elastomer body 12 of closed ring shape finally it can be seen that longitudinal slots 42 running in the y direction are provided in the radially outer region of the receiving openings 14 and 16 around the z axis furthermore slots 44 are likewise provided in the horizontal corner regions surrounding the x axis.