ok i searched a bit and found some good info. I am prolly gunna get an upgraded harness too. But my question is, the h4 9003's fit, but do the h4 9004's fit in a stock cherokee headlight?

this is what im looking at...

http://www.4wheelparts.com/Lighting-...n=HLAH83155212

thanks guys.... i no it's kind of a stupid question, but frankly, I haven't really worked on the headlights where ive had my liscence and cherokees for 2 years because im only 18 and don't want to but the wrong thing

 

You cant just swap out the bulbs in the stock headlights. They are one piece...as in the bulb itself is one with the glass housing. You will need to buy a set of aftermarket housing that you can swap the bulbs out. But I have no answer to your question. If they are both h4 then maybe. But Idk.