You have lots of options. Some re-plate the originals. I opted to buy SS from reasonably priced places for most of the frame hardware, non critical stuff. Engine and critical HW, I buy SS from various vendors now and then, Rocky Point, Clubman, RGM, etc. You can shop around if price conscious which is what I did. madass also sells some SS parts that are good. Take note the washers are not SAE, AN or USS size. I bought my washers from McMaster some in metric because they were closest to the size. I the washers cost me about $30 which is steep for what you get, but they look right. I think there's some UK sources that sell the proper washers. I have a list if you really want it.