MOMO 36 SPLINE BOSS Code: DA5734 slimline boss, measuring only 32mm in depth. Made from single billet aluminium, black anodized, this 36 spline boss also fits all 2015 models. ? Please note the momo horn button will no longer fit due to this being so slim. ?The boss is supplied with screws and pins to cancel the indicators, you do not need to use the pins on 2015 models.