Turn signal switch

So a little while ago my turn signal switch stopped working. It will only turn on the turn signals when I turn on the high beams. So I bought a new one on Ebay that was labeled as tested. I installed it and now the right blinker stays on no matter what when the car is on and the left won't work at all. So I reinstalled the old one and now it only works right half the time. But it is hard finding a turn signal switch for that vesicle so the question is; what should I do to fix this problem? And is there a different turn signal switch I can use from a different car would that be better?