Hi I have an mc21 R with SP shocks front and rear my prob is at 87kgs i seem to be way to heavy for the rear shock.So how to get a new one with a better spring rate HRC no longer stock their springs so I tried race tec they list springs for the 95 sp an mc 28 I think.Will these springs fit my mc21? and same for their fork springs and fork kits anyone have any experience on this one thanks,Bruno.