Hi Doug,
I wonder if your mechanic has much Volvo experience.
Volvo wheel bearings are integral with the hubs, look here for prices
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H1.X2003+volvo+s40+front+hub.TRS0&_nkw=2003+volvo+s40+front+hub&_sacat=0
Others can say if you should get the hub with the seal kit, and if it's a good idea to do both front hubs. Replacing Hubs is a good time to overhaul your brakes if they are coming due, since everything comes apart. You'll save a lot
of labor.
Bill
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