Delica Canada | Mitsubishi Van Club

Which year did the delica start having a 3rd brake light in the back window???

It's either '91 or '92. Are you getting grief from an inspector? Mini-vans sorta fell into the category of trucks and didn't 'require' a third brake-light until '94, although a lot of manufacturers started putting them in before that. If you're looking for one, there are some decent brake lights from Canadian Tire, or you could try sourcing one from one of the mechanics/dealers/part suppliers from this forum.

Actually they don't require one until 1997 if I recall correctly (look at "truck" not "car" in the inspection manual)
however it's usually easier to add one than to argue (they're cheap and simple) the Delicas started getting them in the 1992 model year (I believe August 1991 build dates)