is it simply plug and play just like putting a conversion kit on headlights?

I believe you have to open the fog light and remove the shield so the bulb fits.

However, you can always just find H3-Mini bulbs and those ARE plug-n-play.

I have H3 Mini's (see sig picture).

I would assume so, but just like the headlights, you may end up blinding people with them...so you may want to consider mini-projectors or something else.

you should have no problem at all man, just pull your fog lights out, replace the bulb with what they send you. the only thing i encurrage you to do is mount the ballast somewhere sturdy so they dont bounce around...