Undo the nuts on the battery clamps and disconnect the leads.
Remove the bracket on the side and lift the battery.
Unscrew the battery support. It's usually held by 2 to 4 small bolts
(10 mm), and could be mounted straight or sideways.
The mount is right under the battery, held by a couple of bolts.
Before removing the mount, support the gearbox from below using a jack.
Undo the big nut in the middle. The engine might sag some more, make sure
the jack is holding up. Remove the Torx index screw.
Unbolt the mount from the frame. The front bolt is easy, the one in the
rear is blocked by some wires and hoses - use a spanner to reach it.
Remove the mount. The engine may shift suddenly after the mount is lifted,
watch your fingers!
Old vs new
You can see the crack on the left side of the old mount. The new version is
beefier, and has a provision for a third bolt used on later cars.
Insert the new mount. You may need to pump the jack up some more and
rock the engine back and forth to get the mount to seat properly.
First, fit the Torx index screw to make sure the mount is positioned
correctly. Tighten the upper nut to 62 ft-lbs.
Tighten both mount bolts to 35 ft-lbs. Remove the jack.
Re-install the battery support, the battery itself, tighten the bracket
and connect the leads.