DodgeForum.com - 3rd Gen 96-00 HELP!! Replacing 00 Caravan front passenger seat

Hi,
My father just bought a 2000 Dodge Caravan hadicapable accessible. It didn't have a front passenger (shotgun) seat when he purchased it. We now need one ASAP. I did find one that said it was from a 2000 Caravan, but it didn't fit. The tracks/attachment on the floor were narrower than the wheels/locking mechanism in the bottom of the seat. I am assuming it's a 1999/2000/2001 and a half year model van.
Long and short of it. I need to know which seat will fit in here? And I need to be able to remove it again at a later date.
PLEASE HELP!!