blink-182 Burrito Mod
By Forkie

First, unpack "burrito2.wtd" to desktop (or where you find it easiest).
Open Spark IV.
Click "Browse" and find your GTAIV-directory
Go to pc -> models -> cdimages.
Open "vehicles.img".
Press import, then select the "burrito2.wtd" you just unpacked 
(don't forget to take a backup of the existing one)
Click "rebuild" just to be safe, then save and close vehicles.img.
Click save again in the Main-window of SparkIV and close.
Add "burrito2,	70,89,122," (without quotation-marks) to "carcols.dat" in common/data 
to get the same color van as in the music-video.

P.S: I would recommend using a vehicle/car-spawner, such as this one:

http://www.gtagaming.com/downloads/gta-iv/tools/1931

Enjoy :D