OK I just dug out about 20 mirrors
I have a bunch of them
six of them have map lights
and out of those six, two of them are shorter
all of them were from coupes
the rest
there are three others with short arms
and none of those were from verts
so appearently
there are different ones and there is no rhyme or reason to it
I do know for sure that one mirror was from a four door (it was still sitting in the box with the rest of the parts from that car) and the arm was regular length
if you need a picture I will post some as soon as my camera comes home - it is on vacation with the wife and kids