rear suspension setup

[Skidmarx]

hi guys, been looking around for a stiffer rear spring for the gen 1, but cant realy find what im looking for :S anyone know were i can purchase such an item?? im also investigating rasing the rear by an inch or so, thinking i may need to make some custom length dog bones as i cant find any to raise, only to lower, unless the adjustable ones can work in my favor?? i havnt had alot to do with seting up bike susension, so any help is greatly appreciated :)

cheers, ash