Stainless steel 18-8 < Very commonly used on rebuilds throughout these bikes are available in 2 grades A2 and A4
Class 12.9 steel black oil finish < only good inside engine will rust like a mofo on outside
Chrome plated steel < Will work aswell maybe cost more than stainless?
Zinc plated class 12.9 alloy steel < Closest to original
Grade: higher the number the stronger also higher number = more expensive
JIS / DIN: there isnt really any difference between them one thing you will notice with M8 Hex heads is DIN is a 13mm socket and JIS is 12mm
Be aware some of the bolts on our bikes are not readily available because of strange thread pitch these bolts are:
-Shock bolts and nuts
-Lower triple tree pinch bolts
-Brake caliper mount bolts
-Sprocket nuts
Also check prices at McMasterCarr they may be cheaper and also have a million interesting things and one can almost always find many other useful things
http://www.mcmaster.com