60mm for the park 70mm for the indicator and 165 for the main lights if i was to do it again i would use a yellow/white 2 colour ring for the indicator signal led (has 2 positive wires and one negative) so it it will change colour depending on what cable you put power on, so it would flash yellow with the turn signal. other than that you probs just need a dremel to cut into the the plastic silver surround inside the headlight. headlights come apart just like normal. oven,heat gun or blow torch to warm up the silicone like rubber stuff then pull apart.Also depending on what look you're after you can get different types of leds just make sure its a cob led ring if u want a more solid ring of light!