How to remove T27 Avensis rear hub ?

[Aramsay]

I am changing the hub bearing on my 2013 Avensis Estate.....I have got the caliper out the way, and

have access to the bolts at the back of the hub-carrier, but there is not much of a bolt-head showing to get

a socket onto. The thread is an M12, but the socket/spanner size is either 14 or 15mm.

Any advice on getting these out ?

I was actually thinking of grinding through the x4 bosses of the actual hub to cut the bolts there, and then just knock the bolt remains out...