Search on ebay. There are tons and tons of sets of 4 bolts (stem attachment bolts only), 6 bolts (stem and bar attachment bolts), 7 bolts (including a long one for the stem top cap), etc. Most come from China, but you can specify USA suppliers only if you wish. Also I think you could get them on Amazon. They generally come in two different head types, a very straight lined finish and a curvier finish. Keep in mind the weight savings is so small, that if you have a good hardware store nearby where you can get stainless steel instead, it will save you beaucoup bucks and be almost just as light. Certainly just as good looking and corrosion resistant. Your call.