2017 Mazda BN 3, installation of a rear 4 point subframe. Hardware is included, with nuts and washers. The hardware is needed to tie the brace to the subframe. The middle 4 point square is for added support of structure. The 2017 Mazda bracing is available. Use promo code HOOKMEUP for an additional 10% discount. #mazda #mazda3 #mazdabn #ultraracingusa #ultraracing