I wouldnt think it would run you more than $50 for a new one off ebay,
Im dont remeber right off the top of my head all the hookups back there
but a few well placed squirts of WD may help out. Sorry I cant be of
more help. If you get really ambitious it is possible to swap the
manual unit with the new electronic control unit. You will have to buy
a lot of stuff from the dealer, but its possible....