You could try the Pittsburgh Camera Exchange, their website or on
ebay their seller name is onlinephotostuff . Or maybe Central Camera in Chicago, central-camera-co on
ebay, although I don't usually see small parts listed but you could call/email.
If there's a camera swap in your area you might find parts there. Or try to find another camera like yours that's a junker being sold cheap as a 'parts' camera.