I didn't replace mine, however I did have to remove it to spray some silicone lube in it to quiet down the squeal it was making.

Easy to remove:

Crawl under passenger side and look under dash. It's the black round thing to the right.

There are 4 bolts holding it in place. Loosen with a #10 socket then lower and rotate so that you can unplug the connection.

Once it's removed there should be a decal right on the unit with the part number (mine had one anyway).

Good luck.