steakfries

1979 240D Automatic. Just went to replace the rear wheel and found that wheel hub (think that's what its called) has some stripped bolts. Well, not the bolts, but the hub that the bolts go into. Obviously I'm new to this game. I want to order the part and have a mechanic install it. What's a good go-to site for parts? I'm not having much luck on google results. Thank you.