Vibration going 60+ only turning right Options

[MSKapcala]

I am hoping to get some ideas for what could be causing this, but first a little backstory.

I took my 1997 GT convertible to my mechanic to have some stuff replaced and to check the driver side rear wheel bearing, because when I turned right going 40mph or more I would hear and feel (a little) a vibration-type sound and it felt like it was coming from the rear. It would happen only when turning right, when the weight of the vehicle was shifting left and I was at 40mph or higher.

So my mechanic replaced the rear-wheel bearing and since I have had it back, it seemed fixed. Then this morning, I was going around 60mph turning right around a curve and I heard the noise again, but not quite as pronounced. But again, it's only when turning right and the weight of the vehicle shifts to the left, going 60ish or so now.

Any ideas on what this could be? The front left wheel bearing? Or should I recommend they look at the bushings in the suspension/steering? Originally, they said they couldn't really re-produce the noise, but then eventually came to the conclusion it was the left rear wheel bearing. I drive the vehicle every week, so I know how to "produce it", so to speak.

Any help would be great, I just don't want to be driving and something break and I have a big problem or accident. Thanks!