@Mharriss welcome here!
Kymco uses there M8 normal thread though higher steel quality 8.8 up and 12 mm heads.
-for a in between repair take M8 x 60/50 mm with an13mm head and a washer, available in your hardware store. Use blocker fluid.
-for a final repair see your service shop or go to acar mechanic who repairs japanese cars and ask for such bolts.