A friend sent me this link. If the link doesn't work its on craigslist detroit MI. the phone number is more for western MI, so I don't know exactly where the van is. 2000 gmc 3500 4X4 diesel.
http://detroit.craigslist.org/cto/816872620.html

Must be an old 6.5 never seen one in a van.

duh, its in battle creek, mi. I should go look at it, only 20 min away.

Probably a quigley conv...G

i was wondering if it was "factory"

You can order it from GM but Quigley does them all for GM.