dude...
cortina and escort parts are rare commodities these days. but if you are intending to get the original stuff, call this dude:
Sivam of Syarikat Kamachee
019 312 0041
He has got a shop full of old car parts. He may have what you are looking for. The place is in Batu Caves.
Otherwise , your best bet would be taking a drive up to ipoh as i believe there are some shops that carry continental spares that cover old models.
cheers!