Trac Seats Suspension Kit for Gravely ZT HD & Ariens Ikon XD. Converts your original seat into a smooth riding suspension seat. Low profile suspension kit offers 1 of suspension travel. Weight Adjustment control knob. This kit comes with all components and hardware needed for this application, some assembly required. Seat Safety Switch Wire Extension. Mounting Hardware and Spacers. Gravely and Ariens model mowers with the 8 front to back seat bolt pattern.