Hi, on a 2001 non Denali Yukon it is like a TV remote batery door - you push a little tab to the side and then you can pull the puddle lamp out.
There are 2 small phillips screws to get at the bulb.
Trade Number is 211-2.
Hope this helps, Eggert.
I did it primarily to match all the other hyperwhites which were PIAA's. $18 is rather high. Keep searching because I purchased mine for about $12 with shipping. It won't look like a 747 but the lights will look consistent all around if you're going all hyperwhite.