Progressive Suspension PS-494-1010 494 Sport Series 13.5" Rear Shock Absorbers Black for Dyna 91-05A true sport performance shock at heart with an unbelievable low cost, the 494 Sport Series Shocks feature a high pressure monotube with deflective disc damping technology, hand threaded preload and a rebound adjustment to dial in the ride. This technology coupled with a progressive rate spring allows for a consistent performing shock in a variety of real world scenarios. An engineered jounce bumper with a built in metal cup also helps smooth out and