The brake assembly needs to be removed, the ball joint/a-arm separated from the steering knuckle, the axle removed and then you can access the bolts from the rear. The bolts may be a reversed torx bolt which requires a special tool to remove. If you plan on doing this yourself, you should get a repair manual, there are a few online that are good, alldatadiy.com, chiltondiy.com etc. You have to be careful when doing this job, otherwise you can damage the axle joints, the ABS sensor, or other things. Getting the ball joint off and back on can be very tough, and dangerous, so be very careful! You may consider taking it to a shop for this repair.
I did job in three hours most of the time was spent getting top rear bolt off. I had to push the axle in to get to it. I did not have to remove the ball joint of A frame. Seems to be OK. I will be doing the right one today. I used TIMKEN and w/ labor savings I will have saved appox 700.00 (USD) I expect the right to take about an hour. BTW the bolts were 18mm hex. Not reversed torque (thankfully). I thank you for the info. I also did brakes while I had it tore down.