Mate I had trouble finding one for my AE86. I also only needed the mirror section. Ended up taking it down to O'brien glass and for $40 they put new glass in it.
My mirror had the mechanism and the glass broken. The little device that moves the mirror from the inside of the car I managed to fix but the glass was the the easiest and cheapest. Went to Clarksons with the glass off the other mirror and got them to make two new mirrors (1 normal and 1 reversed) which cost $5 for the pair then I just glued it back in. Good as new!