Rockshox makes separate lowers for each of their forks.you best bet is to contact RS and find out exactly which lowers are right for your bike. then you need to find out where they are available, or if they are available at all. if you're not familiar with rebuilding forks, it might be best to send the fork off to a suspension specialist, but unless the fork was really cheap, this is going to boost the overall cost of the fork over what a new, undamaged one would have cost.