Fitting system for a vehicle seat, in particular a motor vehicle seat, with a) at least one fitting which has a first fitting part and a second fitting part, which are lockable to each other and are rotatable relative to each other about an axis, b) a transmission rod, the rotation of which unlocks the fitting, c) a hand lever, the actuation of which at least indirectly rotates the transmission rod in order to unlock the fitting, d) a stop module which is mounted on the fitting so as to be rotatable about the axis, is formed separately from the hand lever and on the one hand is functionally connected to the hand lever and on the other hand is functionally connected to the transmission rod, and which brings the hand lever and one of the fitting parts (11, 12) into relative abutment in at least one rotational direction, wherein the stop module has at least one stop and one of the fitting parts (11, 12) has at least one counterstop, which stop and counterstop interact in the circumferential direction of the axis and define an angular range, within which the stop module is rotatable relative to the one fitting part (11, 12), e) a return spring with a first spring end and a second spring end, wherein the return spring pretensions the stop in the direction of the counterstop in one rotational direction of the stop module, characterized in that f) one of the two spring ends (54b, 54c) is fastenable to a spring holder of the fitting system or of the vehicle seat, which spring holder is arranged outside the stop module in the radial direction, and in that the stop module is installable as an identical part both on a left side of the vehicle seat and on a right side of the vehicle seat, wherein a return spring for the left side of the vehicle seat is configured differently from a return spring for the right side of the vehicle seat, and the stop module comprises a first marking (50.4) which is assigned to the return spring for the left side of the vehicle seat and a second marking (50.5) which is assigned to the return spring for the right side of the vehicle seat, wherein the first marking (50.4) and the second marking (50.5) are suitable to the effect that, in the correctly fitted state of the fitting system in the vehicle seat, a spring leg of the return spring runs in the region of the assigned marking (54a, 54b). a) at least one fitting which has a first fitting part and a second fitting part, which are lockable to each other and are rotatable relative to each other about an axis, b) a transmission rod, the rotation of which unlocks the fitting, c) a hand lever, the actuation of which at least indirectly rotates the transmission rod in order to unlock the fitting, d) a stop module which is mounted on the fitting so as to be rotatable about the axis, is formed separately from the hand lever and on the one hand is functionally connected to the hand lever and on the other hand is functionally connected to the transmission rod, and which brings the hand lever and one of the fitting parts (11, 12) into relative abutment in at least one rotational direction, wherein the stop module has at least one stop and one of the fitting parts (11, 12) has at least one counterstop, which stop and counterstop interact in the circumferential direction of the axis and define an angular range, within which the stop module is rotatable relative to the one fitting part (11, 12), e) a return spring with a first spring end and a second spring end, wherein the return spring pretensions the stop in the direction of the counterstop in one rotational direction of the stop module, characterized in that f) one of the two spring ends (54b, 54c) is fastenable to a spring holder of the fitting system or of the vehicle seat, which spring holder is arranged outside the stop module in the radial direction,