The best way is to put the whole set from halfcut if you can affort it.
the disc you bought have a same diameter and thickness with your rear brake set?
Hey.. I'm a newbie to DIY. Just bought new bulbs coz my headlight becoming dimmer dy. Want to try fixing myself. Can any sifu teach? :P I got both the H4 bulbs and the W5W ones. Can teach how to change both? Noneed...