call rath racing like prink stated above. daryl can re-valve/re-spring your shocks to any riding style/weight you want. he uses all p.e.p parts and can turn your stock shocks into p.e.p limited mass or zero pre-load shocks. p.e.p is who make the shocks on about 90% of the race quads. to buy these shocks for any other quad you will pay between $1500-$2500 depending on you options. luckily all there stuff is interchangeable with the fox shocks that the predator already has, therefor saving a ton of the cost.