ボルト フランジ- Bolt Flange
 
Bolt with a dimple head, M5, M6, M8, M10, M12:
The reference number is 01500-ZZXXY.
ZZ is the thread size, 05, 06, 08, 10, 12
XX is the length under the head in millimeter
Y is the plating, A for white zinc, 3 or B for black, 7 for chrome
 
You will receive each bolt in a separate sealed plastic bag. OEM stuff is always a safe choice for quality.