Headlight Question

i have a 82 yota and the headlight are getting on so i got some of thos crystal cut ones ive been seeing on ebay, they look pretty cool.anyways the truck headlights are currantly one sealed unit with the bulb inside, the new ones look like they are intended for H4 bulbs, the plugs look like a H4 bulb would slot straight in to it. correct?or will i have to do other crap so i dont have a fire under the hood? lol