The blue thing is your basic clip-on flashing taillight. I bolted the ell shaped bracket to the axle. The bracket that held held my seat to the seat post had worn out. The seat would not stay level, no matter how much I tightened it. I slid the seat as far aft as possible. A second seat clamp, like my original one, connected the coil over shock to the rear of my seat. (My shock was salvaged from pocket rocket. You can get similar shocks on EBay for around 15 bucks). I cut a small notch in the bottom of the coil over shock, so that it fit over the cross brace in my frame. Then I secured the shock to the cross brace in the frame with zip ties. You can do most anything with a hack saw, file and zip ties.