I did read in a post from last year something about having a 5-pin connector at the mirror indicates the harness at least is correct for heaters - the writer indicated he found it, but I swear, I read and re-read the whole thread and I couldn't figure out what year his car was.
I had a 96 Mystique from 96 through 98 (one of Ford's famous 2-year leases) and I loved the idea of standard heated mirrors - my clients at Ford tell me that they are working with the PDCs to have the "Canadian Winter Package" available on all Ford of Canada vehicles - traction control, heated seats, heated mirrors - makes a ton of sense to me.
I'll take a look at the connector in the mirror this weekend and let you know what I find.
BTW - I understand that the pre-98 mirror housing is different from the 98+, but the glass shape is the same - can anyone confirm that?
Thanks and cheers.