One of the red coiler over springs on my passenger side front has cracked. I don't now anything about struts. Is this spring available separately that the strut/shock? Is it a separate part number? Can you actually replace these springs, or is there no way to compress the spring to swap them out? Are they not removable, etc. What are my options to replace? I like the performance of the Bilstein shocks/struts. My brother has Fox shocks/struts on his newer TRD Pro, and had to have Toyota replace them once under warranty for constantly making a clunking noise. I prefer to stay away from Fox. Thanks.