I am planning on lowering my bike 2 inches. The lowering kit I purchased is from "Yana Shika" (I think I spelled that correctly). My concern is that the package states:" For show room use only, Not for highway use". Did I buy the wrong thing? Also, these bones are aluminum and do not have spacers like the original set. The kit will be metal on metal. Should I be concerned? What are you guys using to lower your bikes?:dontknow::'(