i decided to go with 6k but is there a particular bulb size i should get? i have a 03 supercrew

 

also looking to get some in my fogs not sure what size either...not real familiar with these yet sorry lol

 

bulb size i have is 9007 and temperature wise i have a 10k HID you should be good by getting a 6k its not worth getting pulled over for having 10k luckily i have only got a warning so im probably going to switch to a 6k also but make sure you buy a bi-xenon HID kit or say bye to your high beams like me