I did the same thing for my 2003. You have to wire it up and I had to drill some holes for the lights to mount them, but it's way fast and dirt cheap for a first gen.

https://www.amazon.com/AUTOSAVER88-2000-2003-2001-2004-2002-2004-2000-2001/dp/B06XKXQYHF/ref=sr_1_5?ie=UTF8&qid=1531845804&sr=8-5&keywords=xterra+fog+lights