I just remembered that GS had to change my right assy. because the seal went bad, they gave me a new left assy and I had in the garage.
I went out and checked the manfacturer and info on the box.
The ones with the prism on the back reflector are made by Depo for the Ford Taurus 94-95 LX/SE Model
Replacement for 331-1120L-AS
OEM #F4DZ 13008 B
Those numbers above are for the new left side assy. that I have in the box.
The right side is probably different, but I don't know since I don't have the box for the right side that they installed.
Hope this helps.
Frank, I looked at the one you purchased on eBay, but I can't tell by the picture if it has the prism reflector or not. It appears that it does but I can't say that it does to be 100% sure. But the description the seller posted states that it is for ALL models and the LX/SE Models had the prism reflectors, the standard models of the Taurus did not.
UPDATE: I just did some searching on eBay and now I can say that Frank did in fact buy the better light output prism headlights.
Here is a link to a eBay item that has a better picture showing the prism headlight although it is not a good price.